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CVE-2015-2689

Tor before 0.2.4.26 and 0.2.5.x before 0.2.5.11 does not properly handle pending-connection...

7.5 HighFix available

Tor before 0.2.4.26 and 0.2.5.x before 0.2.5.11 does not properly handle pending-connection resolve states during periods of high DNS load, which allows remote attackers to cause a denial of service (assertion failure and daemon exit) via crafted packets.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
None
User interaction
None

What an attacker can affect

Confidentiality
None
Integrity
None
Availability
High

Exploit likelihood

2.19%Up 1.1 points since Feb 4, 2022
90%50%10%1%

What each source reports

NVD Score used 7.5

Tor before 0.2.4.26 and 0.2.5.x before 0.2.5.11 does not properly handle pending-connection resolve states during periods of high DNS load, which allows remote attackers to cause a denial of service (assertion failure and daemon exit) via crafted packets.

Record
CVE-2015-2689
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS 2.0
5.0 MediumAV:N/AC:L/Au:N/C:N/I:N/A:P
Weakness
CWE-20
Updated
2026-11-02
CVE List No score

Tor before 0.2.4.26 and 0.2.5.x before 0.2.5.11 does not properly handle pending-connection resolve states during periods of high DNS load, which allows remote attackers to cause a denial of service (assertion failure and daemon exit) via crafted packets.

Record
CVE-2015-2689
Updated
2026-11-02
EUVDEUVD-2015-2779 No score

Tor before 0.2.4.26 and 0.2.5.x before 0.2.5.11 does not properly handle pending-connection resolve states during periods of high DNS load, which allows remote attackers to cause a denial of service (assertion failure and daemon exit) via crafted packets.

Record
EUVD-2015-2779
Updated
2026-11-03
GitHub AdvisoriesGHSA-7r2c-ch3m-w27x No score

Tor before 0.2.4.26 and 0.2.5.x before 0.2.5.11 does not properly handle pending-connection...

Tor before 0.2.4.26 and 0.2.5.x before 0.2.5.11 does not properly handle pending-connection resolve states during periods of high DNS load, which allows remote attackers to cause a denial of service (assertion failure and daemon exit) via crafted packets.

Record
GHSA-7r2c-ch3m-w27x
Updated
2026-11-02
OSV 7.5

Tor before 0.2.4.26 and 0.2.5.x before 0.2.5.11 does not properly handle pending-connection resolve states during periods of high DNS load, which allows remote attackers to cause a denial of service (assertion failure and daemon exit) via crafted packets.

Record
CVE-2015-2689
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVDEBIAN-CVE-2015-2689 7.5

Tor before 0.2.4.26 and 0.2.5.x before 0.2.5.11 does not properly handle pending-connection resolve states during periods of high DNS load, which allows remote attackers to cause a denial of service (assertion failure and daemon exit) via crafted packets.

Record
DEBIAN-CVE-2015-2689
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVUBUNTU-CVE-2015-2689 7.5

Tor before 0.2.4.26 and 0.2.5.x before 0.2.5.11 does not properly handle pending-connection resolve states during periods of high DNS load, which allows remote attackers to cause a denial of service (assertion failure and daemon exit) via crafted packets.

Record
UBUNTU-CVE-2015-2689
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
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
PackageAffectedFixed
tor
Debian:12
 before 0.2.5.11-1
0.2.5.11-1
tor
Debian:13
 before 0.2.5.11-1
0.2.5.11-1
tor
Debian:14
 before 0.2.5.11-1
0.2.5.11-1
tor
Debian:6.0
From an advisory covering 2 CVEs
 before 0.2.4.26-1~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
0.2.4.26-1~deb6u1
tor
Debian:7
From an advisory covering 2 CVEs
 before 0.2.4.26-1, plus listed versions
0.2.3.25-10.2.4.1-alpha-10.2.4.10-alpha-10.2.4.11-alpha-10.2.4.12-alpha-1
Show 25 moreShow less
0.2.4.12-alpha-20.2.4.13-alpha-10.2.4.14-alpha-10.2.4.15-rc-10.2.4.16-rc-10.2.4.17-rc-10.2.4.18-rc-10.2.4.19-10.2.4.2-alpha-10.2.4.20-10.2.4.21-10.2.4.22-10.2.4.22-1~bpo70+10.2.4.22-1~deb7u10.2.4.23-10.2.4.23-1~deb6u10.2.4.23-1~deb7u10.2.4.24-10.2.4.26-1~deb6u10.2.4.3-alpha-10.2.4.4-alpha-10.2.4.5-alpha-10.2.4.6-alpha-10.2.4.7-alpha-10.2.4.9-alpha-1
0.2.4.26-1
tor
Ubuntu:14.04:LTS
 before 0.2.4.27-1build0.14.04.1, plus listed versions
0.2.3.25-10.2.4.19-10.2.4.20-1
0.2.4.27-1build0.14.04.1
tor
openSUSE:Tumbleweed
From an advisory covering 22 CVEs
 before 0.2.8.11-1.1
0.2.8.11-1.1

History

History
RecordedChangedSources
affected, facts
aliasesEUVD
first indexedCVE List, GitHub Advisories, NVD, OSV

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

In short

CVE-2015-2689 is a high vulnerability (CVSS 7.5) in The Tor Project Tor, published March 22, 2015. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 2.19%, the 82nd percentile. Fixed in tor 0.2.5.11-1.

References

Show 24 moreShow less
This page doesn't list everything

Left out here: 54 versions. The JSON record has them.

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