CVE catalog

CVE-2020-8516

tor: CVE-2020-8516

Severity: Low
Published: Feb 2, 2020, 1:15:10 PM UTC
Source: [NVD] · [CVE record]
EPSS: 2.50% · Oct 25, 2026

The daemon in Tor through 0.4.1.8 and 0.4.2.x through 0.4.2.6 does not verify that a rendezvous node is known before attempting to connect to it, which might make it easier for remote attackers to discover circuit information. NOTE: The network team of Tor claims this is an intended behavior and not a vulnerability

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`	vulnerable
Debian	tor	forky	`0.4.9.14-1`	vulnerable
Debian	tor	trixie	`0.4.9.11-0+deb13u1`	vulnerable
Debian	tor	trixie-security	`0.4.9.14-0+deb13u1`	vulnerable
Debian	tor	bookworm	`0.4.9.11-0+deb12u1`	vulnerable
Debian	tor	bookworm-security	`0.4.9.11-0+deb12u1`	vulnerable

Fixed-version evidence

Distribution	Package	Type	Release	Fixed version	Urgency	Origin	Bugs
Debian	tor	source	sid	`(unfixed)`	unimportant	Not reported	Not reported
Debian	tor	source	forky	`(unfixed)`	unimportant	Not reported	Not reported
Debian	tor	source	trixie	`(unfixed)`	unimportant	Not reported	Not reported
Debian	tor	source	bookworm	`(unfixed)`	unimportant	Not reported	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 · bookworm
  Affected
  dsa · tor · debian · bookworm; dsa · tor · debian · 12
- 0.4.9.11-0+deb12u1 · arm64 · bookworm
  Affected
  dsa · tor · debian · bookworm; dsa · tor · debian · 12
- 0.4.8.14-1~bpo12+1 · amd64 · bookworm-backports
  Affected
  dsa · tor · debian · bookworm; dsa · tor · debian · 12
- 0.4.8.14-1~bpo12+1 · arm64 · bookworm-backports
  Affected
  dsa · tor · debian · bookworm; dsa · tor · debian · 12
- 0.4.9.11-0+deb12u1 · amd64 · bookworm-security
  Affected
  dsa · tor · debian · bookworm; dsa · tor · debian · 12
- 0.4.9.11-0+deb12u1 · arm64 · bookworm-security
  Affected
  dsa · tor · debian · bookworm; dsa · tor · debian · 12
[tor-geoipdb]Unknown
Source package: [tor]
Details (6)
- 0.4.9.11-0+deb12u1 · all · bookworm
  Affected
  dsa · tor · debian · bookworm; dsa · tor · debian · 12
- 0.4.9.11-0+deb12u1 · all · bookworm
  Affected
  dsa · tor · debian · bookworm; dsa · tor · debian · 12
- 0.4.8.14-1~bpo12+1 · all · bookworm-backports
  Affected
  dsa · tor · debian · bookworm; dsa · tor · debian · 12
- 0.4.8.14-1~bpo12+1 · all · bookworm-backports
  Affected
  dsa · tor · debian · bookworm; dsa · tor · debian · 12
- 0.4.9.11-0+deb12u1 · all · bookworm-security
  Affected
  dsa · tor · debian · bookworm; dsa · tor · debian · 12
- 0.4.9.11-0+deb12u1 · all · bookworm-security
  Affected
  dsa · tor · debian · bookworm; dsa · tor · debian · 12

[Debian 13 (Trixie)]

[tor]Unknown
Details (10)
- 0.4.9.11-0+deb13u1 · amd64 · trixie
  Affected
  dsa · tor · debian · 13
- 0.4.9.11-0+deb13u1 · arm64 · trixie
  Affected
  dsa · tor · debian · 13
- 0.4.9.11-1~bpo13+1 · amd64 · trixie-backports
  Affected
  dsa · tor · debian · 13
- 0.4.9.11-1~bpo13+1 · arm64 · trixie-backports
  Affected
  dsa · tor · debian · 13
- 0.4.9.11-0+deb13u1 · amd64 · trixie-security · Historical version
  Affected
  dsa · tor · debian · 13
- 0.4.9.11-0+deb13u1 · arm64 · trixie-security
  Affected
  dsa · tor · debian · 13
- 0.4.9.12-0+deb13u1 · amd64 · trixie-security · Historical version
  Affected
  dsa · tor · debian · 13
- 0.4.9.12-0+deb13u2 · amd64 · trixie-security · Historical version
  Affected
  dsa · tor · debian · 13
- 0.4.9.13-0+deb13u1 · amd64 · trixie-security · Historical version
  Affected
  dsa · tor · debian · 13
- 0.4.9.14-0+deb13u1 · amd64 · trixie-security
  Affected
  dsa · tor · debian · 13
[tor-geoipdb]Unknown
Source package: [tor]
Details (10)
- 0.4.9.11-0+deb13u1 · all · trixie
  Affected
  dsa · tor · debian · 13
- 0.4.9.11-0+deb13u1 · all · trixie
  Affected
  dsa · tor · debian · 13
- 0.4.9.11-1~bpo13+1 · all · trixie-backports
  Affected
  dsa · tor · debian · 13
- 0.4.9.11-1~bpo13+1 · all · trixie-backports
  Affected
  dsa · tor · debian · 13
- 0.4.9.11-0+deb13u1 · all · trixie-security
  Affected
  dsa · tor · debian · 13
- 0.4.9.11-0+deb13u1 · all · trixie-security · Historical version
  Affected
  dsa · tor · debian · 13
- 0.4.9.12-0+deb13u1 · all · trixie-security · Historical version
  Affected
  dsa · tor · debian · 13
- 0.4.9.12-0+deb13u2 · all · trixie-security · Historical version
  Affected
  dsa · tor · debian · 13
- 0.4.9.13-0+deb13u1 · all · trixie-security · Historical version
  Affected
  dsa · tor · debian · 13
- 0.4.9.14-0+deb13u1 · all · trixie-security
  Affected
  dsa · tor · debian · 13

Observed: Oct 23, 2026, 5:53:32 PM UTC

References

[Debian Security Tracker] · [FIRST EPSS] · [OSV Package Vulnerability Database]