dbcve.org
Debian LinuxOperating system · Debian

CVE-2022-25314

HIGH · 7.5 CVSS v3.1 Published 2022-02-18
Fix available
A fix is available. Upgrade to 2.4.5 / 3.1 or later.
See remediation →
84/100
Remediation priority · High
Remotely reachable No privileges Zero-click Patch available

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
In Expat (aka libexpat) before 2.4.5, there is an integer overflow in copyString.

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis
How this class of weakness works · CWE-190

An arithmetic operation produces a value too large for its type and wraps around to an unexpected — often tiny or negative — number. That miscalculated value then drives a memory allocation or a bounds check, opening the door to corruption. The fix is checked arithmetic and validating sizes before they're used.

General guidance for the integer overflow class — the official description and references above are authoritative for this specific CVE. Want a bespoke review and a reviewed fix? Ask our team →

Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.

NVD · CPE data
Debian LinuxOperating system
Affected:= 10.0= 11.0
FedoraOperating system
Affected:= 34= 35
HTTP ServerWeb server / proxy
Affected:= 12.2.1.3.0= 12.2.1.4.0
LibexpatApplication
Affected:< 2.4.5
Zfs Storage Appliance KitApplication
Affected:= 8.8
Sinema Remote Connect ServerApplication
Affected:< 3.1

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

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

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

dbcve · scoped
Upgrade available Upgrade to 2.4.5 / 3.1 or later
Fixed in 2.4.53.1
Vendor patch github.com →
Recommended fix High confidence

libexpat 2.4.5 or later

  1. 1. Identify the libexpat version currently installed on your system (e.g., run 'dpkg -l libexpat1' on Debian/Ubuntu, 'rpm -q libexpat' on Fedora/RHEL, or check the library file version with 'ldd --version' or 'strings /usr/lib/libexpat.so.0 | grep version').
  2. 2. For Debian 10/11: Run 'sudo apt update && sudo apt install libexpat1' to upgrade to the fixed version available in the Debian repositories.
  3. 3. For Fedora 34/35: Run 'sudo dnf update expat' to upgrade to the fixed package.
  4. 4. For Oracle HTTP Server (12.2.1.3.0, 12.2.1.4.0): Apply the Oracle Critical Patch Update or manually update the bundled libexpat library to version 2.4.5 or later.
  5. 5. For Sinema Remote Connect Server: Upgrade to version 3.1 or later which contains the fixed libexpat.
  6. 6. For other affected products: Rebuild or replace the bundled libexpat library with version 2.4.5 or later from https://github.com/libexpat/libexpat/releases.
  7. 7. Restart all services that depend on libexpat (e.g., web servers, XML parsers, applications using Expat) to load the patched library.
Caveat Library upgrades may require restarting dependent services; regression testing of XML parsing functionality is recommended after applying the update.

Generated from the published advisory — verify against the referenced sources before acting.

We can perform the upgrade in your staging environment and verify nothing breaks — typical engagement from $3,200. Get the upgrade done

Scan for this in your stack

Free · runs locally
dbcve dependency scanner

Check whether your project pulls in CVE-2022-25314 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.

Get it on GitHub Scan in the browser

References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2022-25314 in production — separate from our analysis above.

No notes yet

Be the first to add a field note for this CVE — a mitigation you’ve verified, a version caveat, or a link to a working fix. Sign in above to contribute.

What this is

A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.

What belongs here
  • Verified mitigations, workarounds, and config changes
  • Version or environment caveats, and links to real fixes
  • No weaponised exploit code, or anything meant to cause harm
  • No spam, self-promotion, credentials, or personal data