Improper Handling of Exceptional Conditions The advisory has been revoked - it doesn't affect any version of package rxvt (opens in a new tab)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-UBUNTU1604-RXVT-1611546
- published26 Feb 2026
- disclosed20 May 2021
Introduced: 20 May 2021
CVE-2021-33477 (opens in a new tab)Amendment
The Ubuntu security team deemed this advisory irrelevant for Ubuntu:16.04.
NVD Description
Note: Versions mentioned in the description apply only to the upstream rxvt package and not the rxvt package as distributed by Ubuntu.
rxvt-unicode 9.22, rxvt 2.7.10, mrxvt 0.5.4, and Eterm 0.9.7 allow (potentially remote) code execution because of improper handling of certain escape sequences (ESC G Q). A response is terminated by a newline.
References
- http://people.ubuntu.com/~ubuntu-security/cve/CVE-2021-33477
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/6RFMU5YXXNYYVA7G2DAHRXXHO6JKVFUT/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/AO52OLNOOKOCZSJCN3R7Q25XA32BWNWP/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/DUV4LDVZVW7KCGPAMFZD4ZJ4FVLPOX4C/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/NZWGE2RJONBEHSPCBUAW72NTRTIFKZAX/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/SLPVEPBH37EBR4R54RMC6GD33J37HJXD/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/UXAKO6N6NKTR6Z6KVAPEXSZQMRU52SGA/
- https://security.gentoo.org/glsa/202105-17
- http://cvs.schmorp.de/rxvt-unicode/Changes?view=log
- http://cvs.schmorp.de/rxvt-unicode/src/command.C?r1=1.582&r2=1.583
- https://git.enlightenment.org/apps/eterm.git/log/
- https://packetstormsecurity.com/files/162621/rxvt-2.7.0-rxvt-unicode-9.22-Code-Execution.html
- https://sourceforge.net/projects/materm/files/mrxvt%20source/
- https://sourceforge.net/projects/rxvt/files/rxvt-dev/
- https://www.openwall.com/lists/oss-security/2017/05/01/20
- https://www.openwall.com/lists/oss-security/2021/05/17/1
- https://lists.debian.org/debian-lts-announce/2021/05/msg00026.html
- https://lists.debian.org/debian-lts-announce/2021/06/msg00010.html
- https://lists.debian.org/debian-lts-announce/2021/06/msg00011.html
- https://lists.debian.org/debian-lts-announce/2021/06/msg00012.html
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6RFMU5YXXNYYVA7G2DAHRXXHO6JKVFUT/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/AO52OLNOOKOCZSJCN3R7Q25XA32BWNWP/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/DUV4LDVZVW7KCGPAMFZD4ZJ4FVLPOX4C/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/NZWGE2RJONBEHSPCBUAW72NTRTIFKZAX/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/SLPVEPBH37EBR4R54RMC6GD33J37HJXD/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UXAKO6N6NKTR6Z6KVAPEXSZQMRU52SGA/
- https://security.gentoo.org/glsa/202209-07