CVE-2012-3517

Use-after-free vulnerability in dns.c in Tor before 0.2.2.38 might allow remote attackers to...

5.0 MediumFix available

Use-after-free vulnerability in dns.c in Tor before 0.2.2.38 might allow remote attackers to cause a denial of service (daemon crash) via vectors related to failed DNS requests.

Exploit likelihood

2.77%Up 1.4 points since Feb 4, 2022

What each source reports

NVD Score used 5.0

Use-after-free vulnerability in dns.c in Tor before 0.2.2.38 might allow remote attackers to cause a denial of service (daemon crash) via vectors related to failed DNS requests.

Record: CVE-2012-3517
CVSS 2.0: 5.0 MediumAV:N/AC:L/Au:N/C:N/I:N/A:P
Weakness: CWE-399
Updated: 2026-11-02

CVE List No score

Use-after-free vulnerability in dns.c in Tor before 0.2.2.38 might allow remote attackers to cause a denial of service (daemon crash) via vectors related to failed DNS requests.

Record: CVE-2012-3517
Updated: 2026-11-02

EUVDEUVD-2012-3472 No score

Use-after-free vulnerability in dns.c in Tor before 0.2.2.38 might allow remote attackers to cause a denial of service (daemon crash) via vectors related to failed DNS requests.

Record: EUVD-2012-3472
Updated: 2026-11-03

GitHub AdvisoriesGHSA-pww9-9prw-24pv No score

Use-after-free vulnerability in dns.c in Tor before 0.2.2.38 might allow remote attackers to...

Use-after-free vulnerability in dns.c in Tor before 0.2.2.38 might allow remote attackers to cause a denial of service (daemon crash) via vectors related to failed DNS requests.

Record: GHSA-pww9-9prw-24pv
Updated: 2026-11-02

OSV No score

Use-after-free vulnerability in dns.c in Tor before 0.2.2.38 might allow remote attackers to cause a denial of service (daemon crash) via vectors related to failed DNS requests.

Record: CVE-2012-3517
Updated: 2026-11-02

OSVDEBIAN-CVE-2012-3517 No score

Use-after-free vulnerability in dns.c in Tor before 0.2.2.38 might allow remote attackers to cause a denial of service (daemon crash) via vectors related to failed DNS requests.

Record: DEBIAN-CVE-2012-3517
Updated: 2026-11-02

OSVopenSUSE-SU-2024:10423-1 No score

tor-0.2.8.11-1.1 on GA media

These are all security issues fixed in the tor-0.2.8.11-1.1 package on the GA media of openSUSE Tumbleweed.

Record: openSUSE-SU-2024:10423-1
Updated: 2026-11-02

Affected products

Affected packages

Affected packages
Package	Affected	Fixed
`tor` Debian:12	before 0.2.3.20-rc-1	0.2.3.20-rc-1
`tor` Debian:13	before 0.2.3.20-rc-1	0.2.3.20-rc-1
`tor` Debian:14	before 0.2.3.20-rc-1	0.2.3.20-rc-1
`tor` Debian:6.0	before 0.2.4.23-1~deb6u1, plus listed versions 0.2.1.29-10.2.1.30-10.2.1.31-10.2.1.31-1~lenny+10.2.1.32-1 Show 45 moreShow less 0.2.2.1-alpha-10.2.2.10-alpha-10.2.2.10-alpha-20.2.2.11-alpha-10.2.2.12-alpha-10.2.2.13-alpha-10.2.2.14-alpha-10.2.2.15-alpha-10.2.2.16-alpha-10.2.2.17-alpha-10.2.2.18-alpha-10.2.2.18-alpha-20.2.2.19-alpha-10.2.2.2-alpha-10.2.2.20-alpha-10.2.2.21-alpha-10.2.2.22-alpha-10.2.2.23-alpha-10.2.2.27-beta-10.2.2.28-beta-10.2.2.29-beta-10.2.2.3-alpha-10.2.2.30-rc-10.2.2.31-rc-10.2.2.32-10.2.2.32-1~bpo60+10.2.2.33-10.2.2.33-1~bpo60+10.2.2.34-10.2.2.34-1~bpo60+10.2.2.35-10.2.2.35-1~squeeze+10.2.2.36-10.2.2.37-10.2.2.37-1~bpo60+10.2.2.37-1~squeeze+10.2.2.38-10.2.2.39-10.2.2.4-alpha-10.2.2.5-alpha-10.2.2.6-alpha-10.2.2.7-alpha-10.2.2.7-alpha-20.2.2.8-alpha-10.2.2.9-alpha-1	0.2.4.23-1~deb6u1
`tor` openSUSE:Tumbleweed	before 0.2.8.11-1.1	0.2.8.11-1.1

History

History
Recorded	Changed	Sources
Nov 3, 2026	aliases	EUVD
Nov 2, 2026	first indexed	CVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2012-3517 is a medium vulnerability (CVSS 5.0) in Tor, published August 26, 2012. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 2.77%, the 86th percentile. Fixed in tor 0.2.3.20-rc-1.

References

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This page doesn't list everything

Left out here: 50 versions. The JSON record has them.