CVE catalog
CVE-2020-25681
dnsmasq: CVE-2020-25681
- Severity
- High · CVSS 8.1
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 84.08% · Oct 25, 2026
A flaw was found in dnsmasq before version 2.83. A heap-based buffer overflow was discovered in the way RRSets are sorted before validating with DNSSEC data. An attacker on the network, who can forge DNS replies such as that they are accepted as valid, could use this flaw to cause a buffer overflow with arbitrary data in a heap memory segment, possibly executing code on the machine. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Debian | dnsmasq | sid | 2.93-3 | fixed |
| Debian | dnsmasq | forky | 2.93-3 | fixed |
| Debian | dnsmasq | trixie | 2.91-1+deb13u2 | fixed |
| Debian | dnsmasq | trixie-security | 2.91-1+deb13u1 | fixed |
| Debian | dnsmasq | bookworm | 2.90-4~deb12u2 | fixed |
| Debian | dnsmasq | bookworm-security | 2.90-4~deb12u2 | fixed |
| Alpine | dnsmasq | 3.10 | 2.83-r0 | fixed |
| Alpine | dnsmasq | 3.11 | 2.83-r0 | fixed |
| Alpine | dnsmasq | 3.12 | 2.83-r0 | fixed |
| Alpine | dnsmasq | 3.13 | 2.83-r0 | fixed |
| Alpine | dnsmasq | 3.14 | 2.83-r0 | fixed |
| Alpine | dnsmasq | 3.15 | 2.83-r0 | fixed |
| Alpine | dnsmasq | 3.16 | 2.83-r0 | fixed |
| Alpine | dnsmasq | 3.17 | 2.83-r0 | fixed |
| Alpine | dnsmasq | 3.18 | 2.83-r0 | fixed |
| Alpine | dnsmasq | 3.19 | 2.83-r0 | fixed |
| Alpine | dnsmasq | 3.20 | 2.83-r0 | fixed |
| Alpine | dnsmasq | 3.21 | 2.83-r0 | fixed |
| Alpine | dnsmasq | 3.22 | 2.83-r0 | fixed |
| Alpine | dnsmasq | 3.23 | 2.83-r0 | fixed |
| Alpine | dnsmasq | 3.24 | 2.83-r0 | fixed |
| Suse | dnsmasq | linux enterprise high performance computing 15-espos | 2.78-3.11.1 | fixed |
| Suse | dnsmasq | linux enterprise high performance computing 15-ltss | 2.78-3.11.1 | fixed |
| Suse | dnsmasq | linux enterprise server 15-ltss | 2.78-3.11.1 | fixed |
| Suse | dnsmasq | linux enterprise server for sap applications 15 | 2.78-3.11.1 | fixed |
| Suse | dnsmasq | linux enterprise module for basesystem 15 sp1 | 2.78-7.6.1 | fixed |
| Suse | dnsmasq | linux enterprise module for basesystem 15 sp2 | 2.78-7.6.1 | fixed |
| Suse | dnsmasq | linux enterprise point of sale 11 sp3 | 2.78-0.16.14.1 | fixed |
| Opensuse | dnsmasq | leap 15.2 | 2.78-lp152.7.3.1 | fixed |
| Ubuntu | dnsmasq | 16.04 | 2.75-1 | vulnerable |
| Ubuntu | dnsmasq | 16.04 | 2.75-1ubuntu0.16.04.1 | vulnerable |
| Ubuntu | dnsmasq | 16.04 | 2.75-1ubuntu0.16.04.2 | vulnerable |
| Ubuntu | dnsmasq | 16.04 | 2.75-1ubuntu0.16.04.3 | vulnerable |
| Ubuntu | dnsmasq | 16.04 | 2.75-1ubuntu0.16.04.4 | vulnerable |
| Ubuntu | dnsmasq | 16.04 | 2.75-1ubuntu0.16.04.5 | vulnerable |
| Ubuntu | dnsmasq | 16.04 | 2.75-1ubuntu0.16.04.7 | fixed |
| Ubuntu | dnsmasq | 18.04 | 2.78-1 | vulnerable |
| Ubuntu | dnsmasq | 18.04 | 2.78-3 | vulnerable |
| Ubuntu | dnsmasq | 18.04 | 2.79-1 | vulnerable |
| Ubuntu | dnsmasq | 18.04 | 2.79-1ubuntu0.2 | fixed |
| Ubuntu | dnsmasq | 20.04 | 2.80-1ubuntu2 | vulnerable |
| Ubuntu | dnsmasq | 20.04 | 2.80-1ubuntu4 | vulnerable |
| Ubuntu | dnsmasq | 20.04 | 2.80-1.1ubuntu1 | vulnerable |
| Ubuntu | dnsmasq | 20.04 | 2.80-1.1ubuntu1.2 | fixed |
| Opensuse | dnsmasq | leap 15.1 | 2.78-lp151.5.6.1 | fixed |
| Suse | dnsmasq | hpe helion openstack 8 | 2.78-18.15.1 | fixed |
| Suse | dnsmasq | openstack cloud 7 | 2.78-18.15.1 | fixed |
| Suse | dnsmasq | openstack cloud 8 | 2.78-18.15.1 | fixed |
| Suse | dnsmasq | openstack cloud 9 | 2.78-18.15.1 | fixed |
| Suse | dnsmasq | openstack cloud crowbar 8 | 2.78-18.15.1 | fixed |
| Suse | dnsmasq | openstack cloud crowbar 9 | 2.78-18.15.1 | fixed |
| Suse | dnsmasq | linux enterprise server for sap applications 12 sp2 | 2.78-18.15.1 | fixed |
| Suse | dnsmasq | linux enterprise server for sap applications 12 sp3 | 2.78-18.15.1 | fixed |
| Suse | dnsmasq | linux enterprise server for sap applications 12 sp4 | 2.78-18.15.1 | fixed |
| Suse | dnsmasq | linux enterprise server 12 sp2-ltss | 2.78-18.15.1 | fixed |
| Suse | dnsmasq | linux enterprise server 12 sp2-bcl | 2.78-18.15.1 | fixed |
| Suse | dnsmasq | linux enterprise server 12 sp3-ltss | 2.78-18.15.1 | fixed |
| Suse | dnsmasq | linux enterprise server 12 sp3-bcl | 2.78-18.15.1 | fixed |
| Suse | dnsmasq | linux enterprise server 12 sp4-ltss | 2.78-18.15.1 | fixed |
| Suse | dnsmasq | linux enterprise server 12 sp5 | 2.78-18.15.1 | fixed |
| Suse | dnsmasq | linux enterprise server for sap applications 12 sp5 | 2.78-18.15.1 | fixed |
| Suse | dnsmasq | enterprise storage 5 | 2.78-18.15.1 | fixed |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | dnsmasq | source | sid | 2.83-1 | not yet assigned | Not reported | Not reported |
| Debian | dnsmasq | source | forky | 2.83-1 | not yet assigned | Not reported | Not reported |
| Debian | dnsmasq | source | trixie | 2.83-1 | not yet assigned | Not reported | Not reported |
| Debian | dnsmasq | source | bookworm | 2.83-1 | not yet assigned | Not reported | Not reported |
| Alpine | dnsmasq | apk | 3.10 | 2.83-r0 | Not reported | ALPINE-CVE-2020-25681 | Not reported |
| Alpine | dnsmasq | apk | 3.11 | 2.83-r0 | Not reported | ALPINE-CVE-2020-25681 | Not reported |
| Alpine | dnsmasq | apk | 3.12 | 2.83-r0 | Not reported | ALPINE-CVE-2020-25681 | Not reported |
| Alpine | dnsmasq | apk | 3.13 | 2.83-r0 | Not reported | ALPINE-CVE-2020-25681 | Not reported |
| Alpine | dnsmasq | apk | 3.14 | 2.83-r0 | Not reported | ALPINE-CVE-2020-25681 | Not reported |
| Alpine | dnsmasq | apk | 3.15 | 2.83-r0 | Not reported | ALPINE-CVE-2020-25681 | Not reported |
| Alpine | dnsmasq | apk | 3.16 | 2.83-r0 | Not reported | ALPINE-CVE-2020-25681 | Not reported |
| Alpine | dnsmasq | apk | 3.17 | 2.83-r0 | Not reported | ALPINE-CVE-2020-25681 | Not reported |
| Alpine | dnsmasq | apk | 3.18 | 2.83-r0 | Not reported | ALPINE-CVE-2020-25681 | Not reported |
| Alpine | dnsmasq | apk | 3.19 | 2.83-r0 | Not reported | ALPINE-CVE-2020-25681 | Not reported |
| Alpine | dnsmasq | apk | 3.20 | 2.83-r0 | Not reported | ALPINE-CVE-2020-25681 | Not reported |
| Alpine | dnsmasq | apk | 3.21 | 2.83-r0 | Not reported | ALPINE-CVE-2020-25681 | Not reported |
| Alpine | dnsmasq | apk | 3.22 | 2.83-r0 | Not reported | ALPINE-CVE-2020-25681 | Not reported |
| Alpine | dnsmasq | apk | 3.23 | 2.83-r0 | Not reported | ALPINE-CVE-2020-25681 | Not reported |
| Alpine | dnsmasq | apk | 3.24 | 2.83-r0 | Not reported | ALPINE-CVE-2020-25681 | Not reported |
| Suse | dnsmasq | rpm | linux enterprise high performance computing 15-espos | 2.78-3.11.1 | Not reported | SUSE-SU-2021:0162-1 | Not reported |
| Suse | dnsmasq | rpm | linux enterprise high performance computing 15-ltss | 2.78-3.11.1 | Not reported | SUSE-SU-2021:0162-1 | Not reported |
| Suse | dnsmasq | rpm | linux enterprise server 15-ltss | 2.78-3.11.1 | Not reported | SUSE-SU-2021:0162-1 | Not reported |
| Suse | dnsmasq | rpm | linux enterprise server for sap applications 15 | 2.78-3.11.1 | Not reported | SUSE-SU-2021:0162-1 | Not reported |
| Suse | dnsmasq | rpm | linux enterprise module for basesystem 15 sp1 | 2.78-7.6.1 | Not reported | SUSE-SU-2021:0163-1 | Not reported |
| Suse | dnsmasq | rpm | linux enterprise module for basesystem 15 sp2 | 2.78-7.6.1 | Not reported | SUSE-SU-2021:0163-1 | Not reported |
| Suse | dnsmasq | rpm | linux enterprise point of sale 11 sp3 | 2.78-0.16.14.1 | Not reported | SUSE-SU-2021:14604-1 | Not reported |
| Opensuse | dnsmasq | rpm | leap 15.2 | 2.78-lp152.7.3.1 | Not reported | OPENSUSE-SU-2021:0124-1 | Not reported |
| Ubuntu | dnsmasq | deb | 16.04 | 2.75-1ubuntu0.16.04.7 | Not reported | UBUNTU-CVE-2020-25681 | Not reported |
| Ubuntu | dnsmasq | deb | 18.04 | 2.79-1ubuntu0.2 | Not reported | UBUNTU-CVE-2020-25681 | Not reported |
| Ubuntu | dnsmasq | deb | 20.04 | 2.80-1.1ubuntu1.2 | Not reported | UBUNTU-CVE-2020-25681 | Not reported |
| Opensuse | dnsmasq | rpm | leap 15.1 | 2.78-lp151.5.6.1 | Not reported | OPENSUSE-SU-2021:0129-1 | Not reported |
| Suse | dnsmasq | rpm | hpe helion openstack 8 | 2.78-18.15.1 | Not reported | SUSE-SU-2021:0166-1 | Not reported |
| Suse | dnsmasq | rpm | openstack cloud 7 | 2.78-18.15.1 | Not reported | SUSE-SU-2021:0166-1 | Not reported |
| Suse | dnsmasq | rpm | openstack cloud 8 | 2.78-18.15.1 | Not reported | SUSE-SU-2021:0166-1 | Not reported |
| Suse | dnsmasq | rpm | openstack cloud 9 | 2.78-18.15.1 | Not reported | SUSE-SU-2021:0166-1 | Not reported |
| Suse | dnsmasq | rpm | openstack cloud crowbar 8 | 2.78-18.15.1 | Not reported | SUSE-SU-2021:0166-1 | Not reported |
| Suse | dnsmasq | rpm | openstack cloud crowbar 9 | 2.78-18.15.1 | Not reported | SUSE-SU-2021:0166-1 | Not reported |
| Suse | dnsmasq | rpm | linux enterprise server for sap applications 12 sp2 | 2.78-18.15.1 | Not reported | SUSE-SU-2021:0166-1 | Not reported |
| Suse | dnsmasq | rpm | linux enterprise server for sap applications 12 sp3 | 2.78-18.15.1 | Not reported | SUSE-SU-2021:0166-1 | Not reported |
| Suse | dnsmasq | rpm | linux enterprise server for sap applications 12 sp4 | 2.78-18.15.1 | Not reported | SUSE-SU-2021:0166-1 | Not reported |
| Suse | dnsmasq | rpm | linux enterprise server 12 sp2-ltss | 2.78-18.15.1 | Not reported | SUSE-SU-2021:0166-1 | Not reported |
| Suse | dnsmasq | rpm | linux enterprise server 12 sp2-bcl | 2.78-18.15.1 | Not reported | SUSE-SU-2021:0166-1 | Not reported |
| Suse | dnsmasq | rpm | linux enterprise server 12 sp3-ltss | 2.78-18.15.1 | Not reported | SUSE-SU-2021:0166-1 | Not reported |
| Suse | dnsmasq | rpm | linux enterprise server 12 sp3-bcl | 2.78-18.15.1 | Not reported | SUSE-SU-2021:0166-1 | Not reported |
| Suse | dnsmasq | rpm | linux enterprise server 12 sp4-ltss | 2.78-18.15.1 | Not reported | SUSE-SU-2021:0166-1 | Not reported |
| Suse | dnsmasq | rpm | linux enterprise server 12 sp5 | 2.78-18.15.1 | Not reported | SUSE-SU-2021:0166-1 | Not reported |
| Suse | dnsmasq | rpm | linux enterprise server for sap applications 12 sp5 | 2.78-18.15.1 | Not reported | SUSE-SU-2021:0166-1 | Not reported |
| Suse | dnsmasq | rpm | enterprise storage 5 | 2.78-18.15.1 | Not reported | SUSE-SU-2021:0166-1 | Not reported |
OpenFactory catalog packages
Matching against OpenFactory catalog package versions is in progress.
[Debian 12 (Bookworm)]
- [dnsmasq]Unknown
Details (4)
2.90-4~deb12u2· all · bookwormFixed · Fixed:
2.83-1dsa · dnsmasq · debian · bookworm; dsa · dnsmasq · debian · 12
2.90-4~deb12u2· all · bookwormFixed · Fixed:
2.83-1dsa · dnsmasq · debian · bookworm; dsa · dnsmasq · debian · 12
2.90-4~deb12u2· all · bookworm-securityFixed · Fixed:
2.83-1dsa · dnsmasq · debian · bookworm; dsa · dnsmasq · debian · 12
2.90-4~deb12u2· all · bookworm-securityFixed · Fixed:
2.83-1dsa · dnsmasq · debian · bookworm; dsa · dnsmasq · debian · 12
- [dnsmasq-base]Unknown
Source package: [dnsmasq]
Details (4)
2.90-4~deb12u2· amd64 · bookwormFixed · Fixed:
2.83-1dsa · dnsmasq · debian · bookworm; dsa · dnsmasq · debian · 12
2.90-4~deb12u2· arm64 · bookwormFixed · Fixed:
2.83-1dsa · dnsmasq · debian · bookworm; dsa · dnsmasq · debian · 12
2.90-4~deb12u2· amd64 · bookworm-securityFixed · Fixed:
2.83-1dsa · dnsmasq · debian · bookworm; dsa · dnsmasq · debian · 12
2.90-4~deb12u2· arm64 · bookworm-securityFixed · Fixed:
2.83-1dsa · dnsmasq · debian · bookworm; dsa · dnsmasq · debian · 12
- [dnsmasq-base-lua]Unknown
Source package: [dnsmasq]
Details (4)
2.90-4~deb12u2· amd64 · bookwormFixed · Fixed:
2.83-1dsa · dnsmasq · debian · bookworm; dsa · dnsmasq · debian · 12
2.90-4~deb12u2· arm64 · bookwormFixed · Fixed:
2.83-1dsa · dnsmasq · debian · bookworm; dsa · dnsmasq · debian · 12
2.90-4~deb12u2· amd64 · bookworm-securityFixed · Fixed:
2.83-1dsa · dnsmasq · debian · bookworm; dsa · dnsmasq · debian · 12
2.90-4~deb12u2· arm64 · bookworm-securityFixed · Fixed:
2.83-1dsa · dnsmasq · debian · bookworm; dsa · dnsmasq · debian · 12
- [dnsmasq-utils]Unknown
Source package: [dnsmasq]
Details (4)
2.90-4~deb12u2· amd64 · bookwormFixed · Fixed:
2.83-1dsa · dnsmasq · debian · bookworm; dsa · dnsmasq · debian · 12
2.90-4~deb12u2· arm64 · bookwormFixed · Fixed:
2.83-1dsa · dnsmasq · debian · bookworm; dsa · dnsmasq · debian · 12
2.90-4~deb12u2· amd64 · bookworm-securityFixed · Fixed:
2.83-1dsa · dnsmasq · debian · bookworm; dsa · dnsmasq · debian · 12
2.90-4~deb12u2· arm64 · bookworm-securityFixed · Fixed:
2.83-1dsa · dnsmasq · debian · bookworm; dsa · dnsmasq · debian · 12
[Debian 13 (Trixie)]
- [dnsmasq]Unknown
Details (4)
2.91-1+deb13u1· all · trixieFixed · Fixed:
2.83-1dsa · dnsmasq · debian · 13
2.91-1+deb13u1· all · trixieFixed · Fixed:
2.83-1dsa · dnsmasq · debian · 13
2.91-1+deb13u1· all · trixie-securityFixed · Fixed:
2.83-1dsa · dnsmasq · debian · 13
2.91-1+deb13u1· all · trixie-securityFixed · Fixed:
2.83-1dsa · dnsmasq · debian · 13
- [dnsmasq-base]Unknown
Source package: [dnsmasq]
Details (4)
2.91-1+deb13u1· amd64 · trixieFixed · Fixed:
2.83-1dsa · dnsmasq · debian · 13
2.91-1+deb13u1· arm64 · trixieFixed · Fixed:
2.83-1dsa · dnsmasq · debian · 13
2.91-1+deb13u1· amd64 · trixie-securityFixed · Fixed:
2.83-1dsa · dnsmasq · debian · 13
2.91-1+deb13u1· arm64 · trixie-securityFixed · Fixed:
2.83-1dsa · dnsmasq · debian · 13
- [dnsmasq-base-lua]Unknown
Source package: [dnsmasq]
Details (4)
2.91-1+deb13u1· amd64 · trixieFixed · Fixed:
2.83-1dsa · dnsmasq · debian · 13
2.91-1+deb13u1· arm64 · trixieFixed · Fixed:
2.83-1dsa · dnsmasq · debian · 13
2.91-1+deb13u1· amd64 · trixie-securityFixed · Fixed:
2.83-1dsa · dnsmasq · debian · 13
2.91-1+deb13u1· arm64 · trixie-securityFixed · Fixed:
2.83-1dsa · dnsmasq · debian · 13
- [dnsmasq-utils]Unknown
Source package: [dnsmasq]
Details (4)
2.91-1+deb13u1· amd64 · trixieFixed · Fixed:
2.83-1dsa · dnsmasq · debian · 13
2.91-1+deb13u1· arm64 · trixieFixed · Fixed:
2.83-1dsa · dnsmasq · debian · 13
2.91-1+deb13u1· amd64 · trixie-securityFixed · Fixed:
2.83-1dsa · dnsmasq · debian · 13
2.91-1+deb13u1· arm64 · trixie-securityFixed · Fixed:
2.83-1dsa · dnsmasq · debian · 13
Observed:
References
- [https://access.redhat.com/errata/RHSA-2021:0150]
- [https://ftp.suse.com/pub/projects/security/csaf/rhsa-2021_0150.json]
- [https://osv.dev/vulnerability/ALPINE-CVE-2020-25681]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2020-25681]
- [https://osv.dev/vulnerability/DLA-2604-1]
- [https://osv.dev/vulnerability/DSA-4844-1]
- [https://osv.dev/vulnerability/SUSE-SU-2021:0162-1]
- [https://osv.dev/vulnerability/SUSE-SU-2021:0163-1]
- [https://osv.dev/vulnerability/SUSE-SU-2021:0166-1]
- [https://osv.dev/vulnerability/SUSE-SU-2021:14604-1]
- [https://osv.dev/vulnerability/UBUNTU-CVE-2020-25681]
- [https://osv.dev/vulnerability/openSUSE-SU-2021:0124-1]
- [https://osv.dev/vulnerability/openSUSE-SU-2021:0129-1]
- [https://security-tracker.debian.org/tracker/CVE-2020-25681]
- [https://wid.cert-bund.de/.well-known/csaf/white/2021/wid-sec-w-2023-2836.json]
[CERT-Bund public advisories] · [Debian Security Tracker] · [FIRST EPSS] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]