CVE catalog
CVE-2019-8955
tor: CVE-2019-8955
- Severity
- High · CVSS 7.5
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 4.57% · Oct 25, 2026
In Tor before 0.3.3.12, 0.3.4.x before 0.3.4.11, 0.3.5.x before 0.3.5.8, and 0.4.x before 0.4.0.2-alpha, remote denial of service against Tor clients and relays can occur via memory exhaustion in the KIST cell scheduler.
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 | tor | sid | 0.4.9.14-1 | fixed |
| Debian | tor | forky | 0.4.9.14-1 | fixed |
| Debian | tor | trixie | 0.4.9.11-0+deb13u1 | fixed |
| Debian | tor | trixie-security | 0.4.9.14-0+deb13u1 | fixed |
| Debian | tor | bookworm | 0.4.9.11-0+deb12u1 | fixed |
| Debian | tor | bookworm-security | 0.4.9.11-0+deb12u1 | fixed |
| Ubuntu | tor | pro | 0.4.1.5-1 | vulnerable |
| Ubuntu | tor | pro | 0.4.1.5-1build1 | vulnerable |
| Ubuntu | tor | pro | 0.4.1.6-1 | vulnerable |
| Ubuntu | tor | pro | 0.4.2.5-1 | vulnerable |
| Ubuntu | tor | pro | 0.4.2.6-1 | vulnerable |
| Ubuntu | tor | pro | 0.4.2.7-1 | vulnerable |
| Ubuntu | tor | pro | 0.4.2.7-1ubuntu0.1~esm1 | fixed |
| Suse | tor | package hub 12 | 0.3.4.11-bp150.3.6.1 | fixed |
| Suse | tor | package hub 15 | 0.3.4.11-bp150.3.6.1 | fixed |
| Opensuse | tor | leap 15.0 | 0.3.4.11-bp150.3.6.1 | fixed |
| Ubuntu | tor | pro | 0.3.0.10-1 | vulnerable |
| Ubuntu | tor | pro | 0.3.1.8-2 | vulnerable |
| Ubuntu | tor | pro | 0.3.1.9-1 | vulnerable |
| Ubuntu | tor | pro | 0.3.2.9-1 | vulnerable |
| Ubuntu | tor | pro | 0.3.2.9-1build1 | vulnerable |
| Ubuntu | tor | pro | 0.3.2.10-1 | vulnerable |
| Ubuntu | tor | pro | 0.3.2.10-1ubuntu0.1 | vulnerable |
| Ubuntu | tor | pro | 0.3.2.10-1ubuntu0.2~esm1 | fixed |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | tor | source | sid | 0.3.5.8-1 | not yet assigned | Not reported | Not reported |
| Debian | tor | source | forky | 0.3.5.8-1 | not yet assigned | Not reported | Not reported |
| Debian | tor | source | trixie | 0.3.5.8-1 | not yet assigned | Not reported | Not reported |
| Debian | tor | source | bookworm | 0.3.5.8-1 | not yet assigned | Not reported | Not reported |
| Ubuntu | tor | deb | pro | 0.4.2.7-1ubuntu0.1~esm1 | Not reported | USN-5036-1 | Not reported |
| Suse | tor | rpm | package hub 12 | 0.3.4.11-bp150.3.6.1 | Not reported | OPENSUSE-SU-2019:1107-1 | Not reported |
| Suse | tor | rpm | package hub 15 | 0.3.4.11-bp150.3.6.1 | Not reported | OPENSUSE-SU-2019:1107-1 | Not reported |
| Opensuse | tor | rpm | leap 15.0 | 0.3.4.11-bp150.3.6.1 | Not reported | OPENSUSE-SU-2019:1107-1 | Not reported |
| Ubuntu | tor | deb | pro | 0.3.2.10-1ubuntu0.2~esm1 | Not reported | UBUNTU-CVE-2019-8955 | Not reported |
OpenFactory catalog packages
Matching against OpenFactory catalog package versions is in progress.
[Debian 12 (Bookworm)]
- [tor]Unknown
Details (6)
0.4.9.11-0+deb12u1· amd64 · bookwormFixed · Fixed:
0.3.5.8-1dsa · tor · debian · bookworm; dsa · tor · debian · 12
0.4.9.11-0+deb12u1· arm64 · bookwormFixed · Fixed:
0.3.5.8-1dsa · tor · debian · bookworm; dsa · tor · debian · 12
0.4.8.14-1~bpo12+1· amd64 · bookworm-backportsFixed · Fixed:
0.3.5.8-1dsa · tor · debian · bookworm; dsa · tor · debian · 12
0.4.8.14-1~bpo12+1· arm64 · bookworm-backportsFixed · Fixed:
0.3.5.8-1dsa · tor · debian · bookworm; dsa · tor · debian · 12
0.4.9.11-0+deb12u1· amd64 · bookworm-securityFixed · Fixed:
0.3.5.8-1dsa · tor · debian · bookworm; dsa · tor · debian · 12
0.4.9.11-0+deb12u1· arm64 · bookworm-securityFixed · Fixed:
0.3.5.8-1dsa · tor · debian · bookworm; dsa · tor · debian · 12
- [tor-geoipdb]Unknown
Source package: [tor]
Details (6)
0.4.9.11-0+deb12u1· all · bookwormFixed · Fixed:
0.3.5.8-1dsa · tor · debian · bookworm; dsa · tor · debian · 12
0.4.9.11-0+deb12u1· all · bookwormFixed · Fixed:
0.3.5.8-1dsa · tor · debian · bookworm; dsa · tor · debian · 12
0.4.8.14-1~bpo12+1· all · bookworm-backportsFixed · Fixed:
0.3.5.8-1dsa · tor · debian · bookworm; dsa · tor · debian · 12
0.4.8.14-1~bpo12+1· all · bookworm-backportsFixed · Fixed:
0.3.5.8-1dsa · tor · debian · bookworm; dsa · tor · debian · 12
0.4.9.11-0+deb12u1· all · bookworm-securityFixed · Fixed:
0.3.5.8-1dsa · tor · debian · bookworm; dsa · tor · debian · 12
0.4.9.11-0+deb12u1· all · bookworm-securityFixed · Fixed:
0.3.5.8-1dsa · tor · debian · bookworm; dsa · tor · debian · 12
[Debian 13 (Trixie)]
- [tor]Unknown
Details (10)
0.4.9.11-0+deb13u1· amd64 · trixieFixed · Fixed:
0.3.5.8-1dsa · tor · debian · 13
0.4.9.11-0+deb13u1· arm64 · trixieFixed · Fixed:
0.3.5.8-1dsa · tor · debian · 13
0.4.9.11-1~bpo13+1· amd64 · trixie-backportsFixed · Fixed:
0.3.5.8-1dsa · tor · debian · 13
0.4.9.11-1~bpo13+1· arm64 · trixie-backportsFixed · Fixed:
0.3.5.8-1dsa · tor · debian · 13
0.4.9.11-0+deb13u1· amd64 · trixie-security · Historical versionFixed · Fixed:
0.3.5.8-1dsa · tor · debian · 13
0.4.9.11-0+deb13u1· arm64 · trixie-securityFixed · Fixed:
0.3.5.8-1dsa · tor · debian · 13
0.4.9.12-0+deb13u1· amd64 · trixie-security · Historical versionFixed · Fixed:
0.3.5.8-1dsa · tor · debian · 13
0.4.9.12-0+deb13u2· amd64 · trixie-security · Historical versionFixed · Fixed:
0.3.5.8-1dsa · tor · debian · 13
0.4.9.13-0+deb13u1· amd64 · trixie-security · Historical versionFixed · Fixed:
0.3.5.8-1dsa · tor · debian · 13
0.4.9.14-0+deb13u1· amd64 · trixie-securityFixed · Fixed:
0.3.5.8-1dsa · tor · debian · 13
- [tor-geoipdb]Unknown
Source package: [tor]
Details (10)
0.4.9.11-0+deb13u1· all · trixieFixed · Fixed:
0.3.5.8-1dsa · tor · debian · 13
0.4.9.11-0+deb13u1· all · trixieFixed · Fixed:
0.3.5.8-1dsa · tor · debian · 13
0.4.9.11-1~bpo13+1· all · trixie-backportsFixed · Fixed:
0.3.5.8-1dsa · tor · debian · 13
0.4.9.11-1~bpo13+1· all · trixie-backportsFixed · Fixed:
0.3.5.8-1dsa · tor · debian · 13
0.4.9.11-0+deb13u1· all · trixie-securityFixed · Fixed:
0.3.5.8-1dsa · tor · debian · 13
0.4.9.11-0+deb13u1· all · trixie-security · Historical versionFixed · Fixed:
0.3.5.8-1dsa · tor · debian · 13
0.4.9.12-0+deb13u1· all · trixie-security · Historical versionFixed · Fixed:
0.3.5.8-1dsa · tor · debian · 13
0.4.9.12-0+deb13u2· all · trixie-security · Historical versionFixed · Fixed:
0.3.5.8-1dsa · tor · debian · 13
0.4.9.13-0+deb13u1· all · trixie-security · Historical versionFixed · Fixed:
0.3.5.8-1dsa · tor · debian · 13
0.4.9.14-0+deb13u1· all · trixie-securityFixed · Fixed:
0.3.5.8-1dsa · tor · debian · 13
Observed:
References
- [https://ftp.suse.com/pub/projects/security/csaf/opensuse-su-2019_1107-1.json]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2019-8955]
- [https://osv.dev/vulnerability/UBUNTU-CVE-2019-8955]
- [https://osv.dev/vulnerability/USN-5036-1]
- [https://osv.dev/vulnerability/openSUSE-SU-2019:1107-1]
- [https://security-tracker.debian.org/tracker/CVE-2019-8955]
[Debian Security Tracker] · [FIRST EPSS] · [OSV Package Vulnerability Database] · [SUSE security advisories and VEX]