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NVD / CVE Program· CNA mitre

CVE-2022-23852: Expat (aka libexpat) before 2.4.4 has a signed integer overflow in XML_GetBuffer, for configurations with a nonzero XML_CONTEXT_BYTES.

Noroxi assessment

Priority: Plan (action score 41/100)

  • Public proof-of-concept code exists (GitHub); there is no record of exploitation in the wild.
  • Probability of exploitation in the next 30 days: 5% (FIRST EPSS); higher than 92.3% of all records.
  • Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
  • According to CISA the attack is automatable: targets can be found by mass scanning.
  • Fixed version: expat (AlmaLinux:8) 2.2.5-8.el8_6.2; expat-devel (AlmaLinux:8) 2.2.5-8.el8_6.2; expat (Alpine:v3.12) 2.2.10-r1.
  • Mentioned 5 times in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Add it to your regular patch cycle. Upgrade to expat (AlmaLinux:8) 2.2.5-8.el8_6.2; expat-devel (AlmaLinux:8) 2.2.5-8.el8_6.2; expat (Alpine:v3.12) 2.2.10-r1 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

CriticalCVSS 9.8 · v3.1—Proof of concept Fix available
Published
Jan 24, 2022
Updated
Oct 14, 2026
EPSS
5.0% · 92th percentile

Report tools

JSON

Action score

41

Plan

Add it to your regular patch cycle.

CVSS
39 / 40 · 9.8 / 10
CISA KEV
0 / 30 · Not listed
EPSS
2 / 30 · 5.0%

CISA SSVC decision

Exploitation
none
Automatable
yes
Technical impact
total

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
9.8
CNA · mitre
9.8
agree

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • Proof of concept exists, no weaponized module
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2022-23852

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
libexpat projectlibexpat
netappclustered data ontap
netapponcommand workflow automation
tenablenessus
oraclecommunications metasolv solution
debiandebian linux
siemenssinema remote connect server

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • debian debian linux9.0
  • libexpat project libexpatbefore 2.4.4
  • netapp clustered data ontapall versions
  • netapp oncommand workflow automationall versions
  • oracle communications metasolv solution6.3.1
  • siemens sinema remote connect serverbefore 3.1
  • tenable nessus10.0.0 and later · before 10.1.1
  • tenable nessusbefore 8.15.3

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
AlmaLinux:8expatbefore 2.2.5-8.el8_6.22.2.5-8.el8_6.2
AlmaLinux:8expat-develbefore 2.2.5-8.el8_6.22.2.5-8.el8_6.2
Alpine:v3.12expatbefore 2.2.10-r12.2.10-r1
Alpine:v3.13expatbefore 2.2.10-r32.2.10-r3
Alpine:v3.14expatbefore 2.4.4-r02.4.4-r0
Debian:10expatbefore 2.2.6-2+deb10u22.2.6-2+deb10u2
Debian:11expatbefore 2.2.10-2+deb11u12.2.10-2+deb11u1
Debian:12expatbefore 2.4.3-22.4.3-2
Debian:12libxmltokfrom 0—
Debian:9expatbefore 2.2.0-2+deb9u52.2.0-2+deb9u5
Debian:9expatbefore 2.2.0-2+deb9u42.2.0-2+deb9u4
openSUSE:Leap 15.3expatbefore 2.2.5-3.12.12.2.5-3.12.1
openSUSE:Tumbleweedexpatbefore 2.4.4-1.12.4.4-1.1
Red Hat:enterprise_linux:7::clientexpatbefore 0:2.1.0-14.el7_90:2.1.0-14.el7_9
Red Hat:enterprise_linux:7::clientexpat-debuginfobefore 0:2.1.0-14.el7_90:2.1.0-14.el7_9
Red Hat:enterprise_linux:7::clientexpat-develbefore 0:2.1.0-14.el7_90:2.1.0-14.el7_9
Red Hat:enterprise_linux:7::clientexpat-staticbefore 0:2.1.0-14.el7_90:2.1.0-14.el7_9
Red Hat:enterprise_linux:8::baseosexpatbefore 0:2.2.5-4.el8_5.30:2.2.5-4.el8_5.3
Red Hat:enterprise_linux:8::baseosexpat-debuginfobefore 0:2.2.5-4.el8_5.30:2.2.5-4.el8_5.3
Red Hat:enterprise_linux:8::baseosexpat-debugsourcebefore 0:2.2.5-4.el8_5.30:2.2.5-4.el8_5.3
Red Hat:enterprise_linux:8::baseosexpat-develbefore 0:2.2.5-4.el8_5.30:2.2.5-4.el8_5.3
Red Hat:enterprise_linux:9::appstreamexpat-debuginfobefore 0:2.2.10-12.el9_00:2.2.10-12.el9_0
Red Hat:enterprise_linux:9::appstreamexpat-debugsourcebefore 0:2.2.10-12.el9_00:2.2.10-12.el9_0
Red Hat:enterprise_linux:9::appstreamexpat-develbefore 0:2.2.10-12.el9_00:2.2.10-12.el9_0

+9

Same product

libexpat project: all records

Other highest-scoring records for the same primary product.

  • CVE-2022-25236xmlparse.c in Expat (aka libexpat) before 2.4.5 allows attackers to insert namespace-separator characters into namespace URIs.
    50Plan
  • CVE-2022-22822addBinding in xmlparse.c in Expat (aka libexpat) before 2.4.3 has an integer overflow.
    41Plan
  • CVE-2022-25315In Expat (aka libexpat) before 2.4.5, there is an integer overflow in storeRawNames.
    40Plan

Published before and after this one in the same product

  • ← EarlierCVE-2022-22826Jan 10, 2022 · nextScaffoldPart in xmlparse.c in Expat (aka libexpat) before 2.4.3 has an integer overflow.
    36Monitor
  • ← EarlierCVE-2022-22827Jan 10, 2022 · storeAtts in xmlparse.c in Expat (aka libexpat) before 2.4.3 has an integer overflow.
    36Monitor
  • Later →CVE-2022-23990Jan 26, 2022 · Expat (aka libexpat) before 2.4.4 has an integer overflow in the doProlog function.
    31Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
almalinux:expat2.2.5-8.el8_6.2 · AlmaLinux:8Package registry (OSV)
almalinux:expat-devel2.2.5-8.el8_6.2 · AlmaLinux:8Package registry (OSV)
alpine:expat2.2.10-r1 · Alpine:v3.12Package registry (OSV)
debian:expat2.4.3-2 · Debian:12Package registry (OSV)
opensuse:expat2.2.5-3.12.1 · openSUSE:Leap 15.3Package registry (OSV)
red hat:expat0:2.2.10-12.el9_0 · Red Hat:enterprise_linux:9::baseosPackage registry (OSV)
red hat:expat-debuginfo0:2.2.10-12.el9_0 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:expat-debugsource0:2.2.10-12.el9_0 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:expat-devel0:2.2.10-12.el9_0 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:expat-static0:2.1.0-14.el7_9 · Red Hat:enterprise_linux:7::clientPackage registry (OSV)
rocky linux:expat0:2.2.5-4.el8_5.3 · Rocky Linux:8Package registry (OSV)
suse:expat2.1.0-21.15.1 · SUSE:HPE Helion OpenStack 8Package registry (OSV)

Exploit status

Proof of concept available

A public proof of concept or detection signature exists. Exploit knowledge is out there; don't delay patching.

Evidence

  • Proof-of-concept repository on GitHub ×1

Noroxi does not host or link to exploit code. Metasploit module names and Nuclei template ids are shown (names, not code); Exploit-DB entries and PoC repositories are given as counts only.

Public exploit evidence
SourceKindDate
Proof-of-concept repository on GitHubstars:02022-05-10

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

  1. Published
  2. First PoC+106 d
  3. TodayNov 2, 2026+1743 d

No history yet (it accumulates with the daily EPSS job).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

The product’s vendor appears in a public program. Matched by name; verify the scope text in the program.

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

All national notices →

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
high · data can be read
Integrity
high · data or configuration can be modified
Availability
high · the service can be disrupted
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

CWE-190 · Integer Overflow or Wraparound

CVSS vector

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

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

ATT&CK techniques

—

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (9 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records