CVE-2021-33477

HIGH

rxvt-unicode <9.22, rxvt <2.7.10, mrxvt <0.5.4, Eterm <0.9.7 - RCE

Title source: llm

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.

References (20)

[Third Party Advisory] http://cvs.schmorp.de/rxvt-unicode/Changes?view=log

[Patch, Third Party Advisory] http://cvs.schmorp.de/rxvt-unicode/src/command.C?r1=1.582&r2=1.583

[Third Party Advisory] https://git.enlightenment.org/apps/eterm.git/log/

[Mailing List, Third Party Advisory] https://lists.debian.org/debian-lts-announce/2021/05/msg00026.html

[Mailing List, Third Party Advisory] https://lists.debian.org/debian-lts-announce/2021/06/msg00010.html

[Mailing List, Third Party Advisory] https://lists.debian.org/debian-lts-announce/2021/06/msg00011.html

[Mailing List, Third Party Advisory] https://lists.debian.org/debian-lts-announce/2021/06/msg00012.html

[Exploit, Third Party Advisory, VDB Entry] https://packetstormsecurity.com/files/162621/rxvt-2.7.0-rxvt-unicode-9.22-Code-Execution.html

[Third Party Advisory] https://security.gentoo.org/glsa/202105-17

[Third Party Advisory] https://security.gentoo.org/glsa/202209-07

[Product, Third Party Advisory] https://sourceforge.net/projects/materm/files/mrxvt%20source/

[Product, Third Party Advisory] https://sourceforge.net/projects/rxvt/files/rxvt-dev/

[Mailing List, Third Party Advisory] https://www.openwall.com/lists/oss-security/2017/05/01/20

[Exploit, Mailing List, Third Party Advisory] https://www.openwall.com/lists/oss-security/2021/05/17/1

[Mailing List, Third Party Advisory] https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6RFMU5YXXNYYVA7G2DAHRXXHO6JKVFUT/

[Mailing List, Third Party Advisory] https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/AO52OLNOOKOCZSJCN3R7Q25XA32BWNWP/

[Mailing List, Third Party Advisory] https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/DUV4LDVZVW7KCGPAMFZD4ZJ4FVLPOX4C/

[Mailing List, Third Party Advisory] https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/NZWGE2RJONBEHSPCBUAW72NTRTIFKZAX/

[Mailing List, Third Party Advisory] https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/SLPVEPBH37EBR4R54RMC6GD33J37HJXD/

[Mailing List, Third Party Advisory] https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UXAKO6N6NKTR6Z6KVAPEXSZQMRU52SGA/

Scores

CVSS v3 8.8

EPSS 0.0111

EPSS Percentile 78.0%

Attack Vector NETWORK

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Classification

CWE

CWE-755

Status published

Affected Products (7)

eterm_project/eterm

mrxvt_project/mrxvt

rxvt-unicode_project/rxvt-unicode

rxvt_project/rxvt

fedoraproject/fedora

debian/debian_linux

Timeline

Published May 20, 2021

Tracked Since Feb 18, 2026