Home/CVE/xmlparse.c in Expat (aka libexpat) before 2.4.5 allows attackers to insert namespace-separator characters into namespace
CVE

CVE-2022-25236

xmlparse.c in Expat (aka libexpat) before 2.4.5 allows attackers to insert namespace-separator characters into namespace

xmlparse.c in Expat (aka libexpat) before 2.4.5 allows attackers to insert namespace-separator characters into namespace URIs.

CRITICAL · CVSS 9.8 EPSS 0.08156
Act now
  • EPSS percentile: top 8% of all CVEs by exploitation likelihood
  • Public exploit or PoC is available
  • SSVC automatable: yes - attacks can be scripted at scale
  • CVSS base score ≥ 7.0
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-668Exposure of Resource to Wrong Sphere
CWE-668Exposure of Resource to Wrong Sphere
▤

Affected Products & Versions

5
libexpat project libexpat< 2.4.5
debian linuxall versions
oracle http serverall versions
oracle zfs storage appliance kitall versions
siemens sinema remote connect server< 3.1
⚠

Public Exploits & PoCs

1
pocpacketstormsecurity.com · Zoom-XMPP-Stanza-Smuggling-Remote-Code-Execution.htmlpacketstormsecurity.com
▣

Scoring & Timeline

9.8
CRITICAL · CVSS v3.1 · cve@mitre.org
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD16 Feb 2022 · 01:15 AM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
SSVC triage · cisa-vulnrichment
Exploitation
none
Automatable
yes
Technical impact
total
SSVC asks the questions that actually drive patch urgency: is it being exploited, can attacks be automated, and how total is the impact.
⚑

Vendor Advisories

30
usnUSN-8316-1
usnUSN-8314-1
usnUSN-8313-1
usnUSN-8235-1
usnUSN-8241-1
🔗

References & Sources

10
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
http://www.openwall.com/lists/oss-security/2022/02/19/1Mailing ListThird Party Advisory
https://cert-portal.siemens.com/productcert/pdf/ssa-484086.pdfThird Party Advisory
https://github.com/libexpat/libexpat/pull/561PatchThird Party Advisory
https://lists.debian.org/debian-lts-announce/2022/03/msg00007.htmlThird Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/3UFRBA3UQVIQKXTBUQXDWQOVWNBKLERU/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/Y27XO3JMKAOMQZVPS3B4MJGEAHCZF5OM/
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