CVE catalog
CVE-2021-4160
openssl: CVE-2021-4160
- Severity
- Medium · CVSS 5.9
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 3.77% · Oct 25, 2026
There is a carry propagation bug in the MIPS32 and MIPS64 squaring procedure. Many EC algorithms are affected, including some of the TLS 1.3 default curves. Impact was not analyzed in detail, because the pre-requisites for attack are considered unlikely and include reusing private keys. Analysis suggests that attacks against RSA and DSA as a result of this defect would be very difficult to perform and are not believed likely. Attacks against DH are considered just feasible (although very difficult) because most of the work necessary to deduce information about a private key may be performed offline. The amount of resources required for such an attack would be significant. However, for an attack on TLS to be meaningful, the server would have to share the DH private key among multiple clients, which is no longer an option since CVE-2016-0701. This issue affects OpenSSL versions 1.0.2, 1.1.1 and 3.0.0. It was addressed in the releases of 1.1.1m and 3.0.1 on the 15th of December 2021. For the 1.0.2 release it is addressed in git commit 6fc1aaaf3 that is available to premium support customers only. It will be made available in 1.0.2zc when it is released. The issue only affects OpenSSL on MIPS platforms. Fixed in OpenSSL 3.0.1 (Affected 3.0.0). Fixed in OpenSSL 1.1.1m (Affected 1.1.1-1.1.1l). Fixed in OpenSSL 1.0.2zc-dev (Affected 1.0.2-1.0.2zb).
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 | openssl | sid | 3.6.5-1 | fixed |
| Debian | openssl | forky | 3.6.5-1 | fixed |
| Debian | openssl | trixie | 3.5.7-1~deb13u2 | fixed |
| Debian | openssl | trixie-security | 3.5.7-1~deb13u3 | fixed |
| Debian | openssl | bookworm | 3.0.20-1~deb12u2 | fixed |
| Debian | openssl | bookworm-security | 3.0.22-1~deb12u2 | fixed |
| Ubuntu | edk2 | pro | 0~20150106.5c2d456b-2 | vulnerable |
| Ubuntu | edk2 | pro | 0~20160104.c2a892d7-1 | vulnerable |
| Ubuntu | edk2 | pro | 0~20160408.ffea0a2c-2 | vulnerable |
| Ubuntu | edk2 | pro | 0~20160408.ffea0a2c-2ubuntu0.1 | vulnerable |
| Ubuntu | edk2 | pro | 0~20160408.ffea0a2c-2ubuntu0.2 | vulnerable |
| Ubuntu | edk2 | pro | 0~20160408.ffea0a2c-2ubuntu0.2+esm1 | vulnerable |
| Ubuntu | edk2 | pro | 0~20160408.ffea0a2c-2ubuntu0.2+esm3 | vulnerable |
| Ubuntu | edk2 | pro | 0~20160408.ffea0a2c-2ubuntu0.2+esm4 | vulnerable |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | openssl | source | sid | 1.1.1m-1 | not yet assigned | Not reported | Not reported |
| Debian | openssl | source | forky | 1.1.1m-1 | not yet assigned | Not reported | Not reported |
| Debian | openssl | source | trixie | 1.1.1m-1 | not yet assigned | Not reported | Not reported |
| Debian | openssl | source | bookworm | 1.1.1m-1 | not yet assigned | Not reported | Not reported |
OpenFactory catalog packages
Matching against OpenFactory catalog package versions is in progress.
[Debian 12 (Bookworm)]
- [libssl3]Unknown
Source package: [openssl]
Details (6)
3.0.20-1~deb12u2· amd64 · bookwormFixed · Fixed:
1.1.1m-1dsa · openssl · debian · bookworm; dsa · openssl · debian · 12
3.0.20-1~deb12u2· arm64 · bookwormFixed · Fixed:
1.1.1m-1dsa · openssl · debian · bookworm; dsa · openssl · debian · 12
3.0.20-1~deb12u2· amd64 · bookworm-securityFixed · Fixed:
1.1.1m-1dsa · openssl · debian · bookworm; dsa · openssl · debian · 12
3.0.20-1~deb12u2· arm64 · bookworm-securityFixed · Fixed:
1.1.1m-1dsa · openssl · debian · bookworm; dsa · openssl · debian · 12
3.0.17-1~deb12u2· amd64 · bookworm-updatesFixed · Fixed:
1.1.1m-1dsa · openssl · debian · bookworm; dsa · openssl · debian · 12
3.0.17-1~deb12u2· arm64 · bookworm-updatesFixed · Fixed:
1.1.1m-1dsa · openssl · debian · bookworm; dsa · openssl · debian · 12
- [libssl-dev]Unknown
Source package: [openssl]
Details (6)
3.0.20-1~deb12u2· amd64 · bookwormFixed · Fixed:
1.1.1m-1dsa · openssl · debian · bookworm; dsa · openssl · debian · 12
3.0.20-1~deb12u2· arm64 · bookwormFixed · Fixed:
1.1.1m-1dsa · openssl · debian · bookworm; dsa · openssl · debian · 12
3.0.20-1~deb12u2· amd64 · bookworm-securityFixed · Fixed:
1.1.1m-1dsa · openssl · debian · bookworm; dsa · openssl · debian · 12
3.0.20-1~deb12u2· arm64 · bookworm-securityFixed · Fixed:
1.1.1m-1dsa · openssl · debian · bookworm; dsa · openssl · debian · 12
3.0.17-1~deb12u2· amd64 · bookworm-updatesFixed · Fixed:
1.1.1m-1dsa · openssl · debian · bookworm; dsa · openssl · debian · 12
3.0.17-1~deb12u2· arm64 · bookworm-updatesFixed · Fixed:
1.1.1m-1dsa · openssl · debian · bookworm; dsa · openssl · debian · 12
- [libssl-doc]Unknown
Source package: [openssl]
Details (6)
3.0.20-1~deb12u2· all · bookwormFixed · Fixed:
1.1.1m-1dsa · openssl · debian · bookworm; dsa · openssl · debian · 12
3.0.20-1~deb12u2· all · bookwormFixed · Fixed:
1.1.1m-1dsa · openssl · debian · bookworm; dsa · openssl · debian · 12
3.0.20-1~deb12u2· all · bookworm-securityFixed · Fixed:
1.1.1m-1dsa · openssl · debian · bookworm; dsa · openssl · debian · 12
3.0.20-1~deb12u2· all · bookworm-securityFixed · Fixed:
1.1.1m-1dsa · openssl · debian · bookworm; dsa · openssl · debian · 12
3.0.17-1~deb12u2· all · bookworm-updatesFixed · Fixed:
1.1.1m-1dsa · openssl · debian · bookworm; dsa · openssl · debian · 12
3.0.17-1~deb12u2· all · bookworm-updatesFixed · Fixed:
1.1.1m-1dsa · openssl · debian · bookworm; dsa · openssl · debian · 12
- [openssl]Unknown
Details (6)
3.0.20-1~deb12u2· amd64 · bookwormFixed · Fixed:
1.1.1m-1dsa · openssl · debian · bookworm; dsa · openssl · debian · 12
3.0.20-1~deb12u2· arm64 · bookwormFixed · Fixed:
1.1.1m-1dsa · openssl · debian · bookworm; dsa · openssl · debian · 12
3.0.20-1~deb12u2· amd64 · bookworm-securityFixed · Fixed:
1.1.1m-1dsa · openssl · debian · bookworm; dsa · openssl · debian · 12
3.0.20-1~deb12u2· arm64 · bookworm-securityFixed · Fixed:
1.1.1m-1dsa · openssl · debian · bookworm; dsa · openssl · debian · 12
3.0.17-1~deb12u2· amd64 · bookworm-updatesFixed · Fixed:
1.1.1m-1dsa · openssl · debian · bookworm; dsa · openssl · debian · 12
3.0.17-1~deb12u2· arm64 · bookworm-updatesFixed · Fixed:
1.1.1m-1dsa · openssl · debian · bookworm; dsa · openssl · debian · 12
[Debian 13 (Trixie)]
- [libssl3t64]Unknown
Source package: [openssl]
Details (6)
3.5.6-1~deb13u2· amd64 · trixieFixed · Fixed:
1.1.1m-1dsa · openssl · debian · 13
3.5.6-1~deb13u2· arm64 · trixieFixed · Fixed:
1.1.1m-1dsa · openssl · debian · 13
3.5.6-1~deb13u2· amd64 · trixie-security · Historical versionFixed · Fixed:
1.1.1m-1dsa · openssl · debian · 13
3.5.7-1~deb13u2· amd64 · trixie-security · Historical versionFixed · Fixed:
1.1.1m-1dsa · openssl · debian · 13
3.5.7-1~deb13u2· arm64 · trixie-securityFixed · Fixed:
1.1.1m-1dsa · openssl · debian · 13
3.5.7-1~deb13u3· amd64 · trixie-securityFixed · Fixed:
1.1.1m-1dsa · openssl · debian · 13
- [libssl-dev]Unknown
Source package: [openssl]
Details (6)
3.5.6-1~deb13u2· amd64 · trixieFixed · Fixed:
1.1.1m-1dsa · openssl · debian · 13
3.5.6-1~deb13u2· arm64 · trixieFixed · Fixed:
1.1.1m-1dsa · openssl · debian · 13
3.5.6-1~deb13u2· amd64 · trixie-security · Historical versionFixed · Fixed:
1.1.1m-1dsa · openssl · debian · 13
3.5.7-1~deb13u2· amd64 · trixie-security · Historical versionFixed · Fixed:
1.1.1m-1dsa · openssl · debian · 13
3.5.7-1~deb13u2· arm64 · trixie-securityFixed · Fixed:
1.1.1m-1dsa · openssl · debian · 13
3.5.7-1~deb13u3· amd64 · trixie-securityFixed · Fixed:
1.1.1m-1dsa · openssl · debian · 13
- [libssl-doc]Unknown
Source package: [openssl]
Details (6)
3.5.6-1~deb13u2· all · trixieFixed · Fixed:
1.1.1m-1dsa · openssl · debian · 13
3.5.6-1~deb13u2· all · trixieFixed · Fixed:
1.1.1m-1dsa · openssl · debian · 13
3.5.6-1~deb13u2· all · trixie-security · Historical versionFixed · Fixed:
1.1.1m-1dsa · openssl · debian · 13
3.5.7-1~deb13u2· all · trixie-securityFixed · Fixed:
1.1.1m-1dsa · openssl · debian · 13
3.5.7-1~deb13u2· all · trixie-security · Historical versionFixed · Fixed:
1.1.1m-1dsa · openssl · debian · 13
3.5.7-1~deb13u3· all · trixie-securityFixed · Fixed:
1.1.1m-1dsa · openssl · debian · 13
- [openssl]Unknown
Details (6)
3.5.6-1~deb13u2· amd64 · trixieFixed · Fixed:
1.1.1m-1dsa · openssl · debian · 13
3.5.6-1~deb13u2· arm64 · trixieFixed · Fixed:
1.1.1m-1dsa · openssl · debian · 13
3.5.6-1~deb13u2· amd64 · trixie-security · Historical versionFixed · Fixed:
1.1.1m-1dsa · openssl · debian · 13
3.5.7-1~deb13u2· amd64 · trixie-security · Historical versionFixed · Fixed:
1.1.1m-1dsa · openssl · debian · 13
3.5.7-1~deb13u2· arm64 · trixie-securityFixed · Fixed:
1.1.1m-1dsa · openssl · debian · 13
3.5.7-1~deb13u3· amd64 · trixie-securityFixed · Fixed:
1.1.1m-1dsa · openssl · debian · 13
- [openssl-provider-fips]Unknown
Source package: [openssl]
Details (6)
3.5.6-1~deb13u2· amd64 · trixieFixed · Fixed:
1.1.1m-1dsa · openssl · debian · 13
3.5.6-1~deb13u2· arm64 · trixieFixed · Fixed:
1.1.1m-1dsa · openssl · debian · 13
3.5.6-1~deb13u2· amd64 · trixie-security · Historical versionFixed · Fixed:
1.1.1m-1dsa · openssl · debian · 13
3.5.7-1~deb13u2· amd64 · trixie-security · Historical versionFixed · Fixed:
1.1.1m-1dsa · openssl · debian · 13
3.5.7-1~deb13u2· arm64 · trixie-securityFixed · Fixed:
1.1.1m-1dsa · openssl · debian · 13
3.5.7-1~deb13u3· amd64 · trixie-securityFixed · Fixed:
1.1.1m-1dsa · openssl · debian · 13
- [openssl-provider-legacy]Unknown
Source package: [openssl]
Details (6)
3.5.6-1~deb13u2· amd64 · trixieFixed · Fixed:
1.1.1m-1dsa · openssl · debian · 13
3.5.6-1~deb13u2· arm64 · trixieFixed · Fixed:
1.1.1m-1dsa · openssl · debian · 13
3.5.6-1~deb13u2· amd64 · trixie-security · Historical versionFixed · Fixed:
1.1.1m-1dsa · openssl · debian · 13
3.5.7-1~deb13u2· amd64 · trixie-security · Historical versionFixed · Fixed:
1.1.1m-1dsa · openssl · debian · 13
3.5.7-1~deb13u2· arm64 · trixie-securityFixed · Fixed:
1.1.1m-1dsa · openssl · debian · 13
3.5.7-1~deb13u3· amd64 · trixie-securityFixed · Fixed:
1.1.1m-1dsa · openssl · debian · 13
Observed:
References
- [https://cert-portal.siemens.com/productcert/csaf/ssa-637483.json]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2021-4160]
- [https://osv.dev/vulnerability/DSA-5103-1]
- [https://osv.dev/vulnerability/UBUNTU-CVE-2021-4160]
- [https://security-tracker.debian.org/tracker/CVE-2021-4160]
- [https://security.access.redhat.com/data/csaf/v2/vex/2021/cve-2021-4160.json]
- [https://wid.cert-bund.de/.well-known/csaf/white/2022/wid-sec-w-2022-0302.json]
[CERT-Bund public advisories] · [CISA cybersecurity advisories] · [Debian Security Tracker] · [FIRST EPSS] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX]