High
Security advisory
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.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2021-33477
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 04:27 UTC · Revision 1
Source evidence
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.
osv:CVE-2021-33477
Complete source record
{
"id": "8b1c021987ddc0b371fe8ae5c848892f2bf6cd1b9d5a56f28442c19d1e9ec4e7",
"url": "https://osv.dev/vulnerability/CVE-2021-33477",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "CVE-2021-33477",
"summary": "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.",
"evidence": "osv:CVE-2021-33477",
"products": [],
"severity": "high",
"structured": {
"id": "CVE-2021-33477",
"aliases": [
"CVE-2021-33477"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/exg/rxvt-unicode",
"type": "GIT",
"events": [
{
"introduced": "df03d2705271fdb3eeccad9e191bba45cb872b96"
},
{
"last_affected": "df03d2705271fdb3eeccad9e191bba45cb872b96"
}
],
"database_specific": {
"extracted_events": [
{
"cpe": "cpe:2.3:a:rxvt-unicode_project:rxvt-unicode:9.22:*:*:*:*:*:*:*",
"range": [
{
"introduced": "9.22"
},
{
"last_affected": "9.22"
}
],
"source": "CPE_STRING"
}
]
}
}
],
"versions": [
"9.22",
"rxvt-unicode-9.22"
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-33477.json"
}
}
],
"modified": "2026-10-24T10:30:18.546487418Z",
"provider": "osv",
"references": [
"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://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://security.gentoo.org/glsa/202105-17",
"https://security.gentoo.org/glsa/202209-07",
"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://packetstormsecurity.com/files/162621/rxvt-2.7.0-rxvt-unicode-9.22-Code-Execution.html",
"https://www.openwall.com/lists/oss-security/2021/05/17/1"
],
"provider_metadata": {
"unresolved_ranges": [
{
"cpes": [
"cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*"
],
"vendor_product": "debian:debian_linux",
"extracted_events": [
{
"range": [
{
"introduced": "9.0"
},
{
"last_affected": "9.0"
}
],
"source": "CPE_STRING"
}
]
},
{
"cpes": [
"cpe:2.3:a:eterm_project:eterm:0.9.7:*:*:*:*:*:*:*"
],
"vendor_product": "eterm_project:eterm",
"extracted_events": [
{
"range": [
{
"introduced": "0.9.7"
},
{
"last_affected": "0.9.7"
}
],
"source": "CPE_STRING"
}
]
},
{
"cpes": [
"cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*",
"cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*"
],
"vendor_product": "fedoraproject:fedora",
"extracted_events": [
{
"range": [
{
"introduced": "33"
},
{
"last_affected": "33"
},
{
"introduced": "34"
},
{
"last_affected": "34"
}
],
"source": "CPE_STRING"
}
]
},
{
"cpes": [
"cpe:2.3:a:mrxvt_project:mrxvt:0.5.4:*:*:*:*:*:*:*"
],
"vendor_product": "mrxvt_project:mrxvt",
"extracted_events": [
{
"range": [
{
"introduced": "0.5.4"
},
{
"last_affected": "0.5.4"
}
],
"source": "CPE_STRING"
}
]
},
{
"cpes": [
"cpe:2.3:a:rxvt_project:rxvt:2.7.10:*:*:*:*:*:*:*"
],
"vendor_product": "rxvt_project:rxvt",
"extracted_events": [
{
"range": [
{
"introduced": "2.7.10"
},
{
"last_affected": "2.7.10"
}
],
"source": "CPE_STRING"
}
]
}
]
}
},
"related_cves": [
{
"value": "CVE-2021-33477",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 429800,
"published_at": "2021-05-20T20:15:07.397+00:00"
}