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 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.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (2.19%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
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.
- CVSS 3.1
- 7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 2.19% probability · 81th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-20
- Affected
- torproject/tor
- Source
- security@debian.org
References
- https://lists.torproject.org/pipermail/tor-talk/2015-March/037281.htmlMailing List, Vendor Advisory
- https://trac.torproject.org/projects/tor/ticket/14129Patch, Vendor Advisory
- https://lists.torproject.org/pipermail/tor-talk/2015-March/037281.htmlMailing List, Vendor Advisory
- https://trac.torproject.org/projects/tor/ticket/14129Patch, Vendor Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.