--- title: "CVE-2012-4922\n | Ubuntu" description: Ubuntu is an open source software operating system that runs from the desktop, to the cloud, to all your internet connected things. url: https://ubuntu.com/security/CVE-2012-4922?format=md keywords: index, follow --- # CVE-2012-4922 Publication date 14 September 2012 Last updated 17 July 2025 --- Ubuntu priority **Medium** [Why this priority?](https://ubuntu.com/security/cves/about#priority ) Toggle side navigation ## Description The tor\_timegm function in common/util.c in Tor before 0.2.2.39, and 0.2.3.x before 0.2.3.22-rc, does not properly validate time values, which allows remote attackers to cause a denial of service (assertion failure and daemon exit) via a malformed directory object, a different vulnerability than CVE-2012-4419. ## Status Show unmaintained releases | Package | Ubuntu Release | Status | | --- | --- | --- | | tor | 17.04 zesty | Fixed 0.2.3.22-rc-1 | | 16.10 yakkety | Fixed 0.2.3.22-rc-1 | | 16.04 LTS xenial | Fixed 0.2.3.22-rc-1 | | 15.10 wily | Fixed 0.2.3.22-rc-1 | | 15.04 vivid | Fixed 0.2.3.22-rc-1 | | 14.10 utopic | Fixed 0.2.3.22-rc-1 | | 14.04 LTS trusty | Fixed 0.2.3.22-rc-1 | | 13.10 saucy | Fixed 0.2.3.22-rc-1 | | 13.04 raring | Fixed 0.2.3.22-rc-1 | | 12.10 quantal | Fixed 0.2.3.22-rc-1 | | 12.04 LTS precise | Ignored end of life | | 11.10 oneiric | Ignored end of life | | 11.04 natty | Ignored end of life | | 10.04 LTS lucid | Not in release | | 8.04 LTS hardy | Ignored end of life | --- * [How can I get the fixes?](https://ubuntu.com/security/cves/about#security) * [What do statuses mean?](https://ubuntu.com/security/cves/about#statuses) ## References * [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2012-4922) * [NVD](https://nvd.nist.gov/vuln/detail/CVE-2012-4922) * [Launchpad](https://launchpad.net/bugs/cve/CVE-2012-4922) * [Debian](https://security-tracker.debian.org/tracker/CVE-2012-4922) ### Other references * * * * * *