What’s Vulnerable › Vulnerabilities

CVE-2021-33477

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 4.1% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-05-20 · updated 2026-06-17
• Weakness: CWE-755

Description

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.

Affected products

• Debian Linux: 9.0
• Eterm Project Eterm: 0.9.7
• Fedoraproject Fedora: 33, 34
• Mrxvt Project Mrxvt: 0.5.4
• Rxvt-Unicode Project Rxvt-Unicode: 9.22
• Rxvt Project Rxvt: 2.7.10

References

• 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://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/

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