CVE-2021-46143

CWE-190 — Integer Overflow14 documents9 sources
Severity
7.8HIGH
EPSS
4.1%
top 11.43%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
4
Libexpat Project LibexpatSiemens Sinema Remote Connect ServerTenable Nessus+1 more
Timeline
PublishedJan 6
Latest updateDec 4

Description

In doProlog in xmlparse.c in Expat (aka libexpat) before 2.4.3, an integer overflow exists for m_groupSize.

CVSS vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:HExploitability: 2.2 | Impact: 5.9

Affected Packages6 packages

▶Debianexpat< 2.2.10-2+deb11u1+3
▶NVDtenable/nessus10.0.0 — 10.1.1+1
▶Ubuntulibxmltok< 1.2-3ubuntu0.16.04.1~esm2+3

Patches

Patch: www.openwall.com ↗Patch: cert-portal.siemens.com ↗Patch: github.com ↗

🔴Vulnerability Details

5
OSV
mame vulnerabilities↗2025-12-04
▶
OSV
libxmltok vulnerabilities↗2022-07-19
▶
GHSA
GHSA-j6g2-cvhq-p8xr: In doProlog in xmlparse↗2022-02-10
▶
OSV
CVE-2021-46143: In doProlog in xmlparse↗2022-01-06
▶
CVEList
CVE-2021-46143: In doProlog in xmlparse↗2022-01-06
▶

📋Vendor Advisories

7
Ubuntu
MAME vulnerabilities↗2025-12-04
▶
Ubuntu
xmltok library vulnerabilities↗2025-01-13
▶
Ubuntu
xmltok library vulnerabilities↗2022-07-19
▶
Ubuntu
Expat vulnerabilities↗2022-02-21
▶
Red Hat
expat: Integer overflow in doProlog in xmlparse.c↗2022-01-15
▶
CVE-2021-46143 (HIGH CVSS 7.8) | In doProlog in xmlparse.c in Expat | cvebase.io