Known exploited vulnerability
CVE-2025-27363
The short answer
CVE-2025-27363 affects FreeType FreeType and is rated high (CVSS 8.1). CISA added it to the Known Exploited Vulnerabilities catalog on 2025-05-06: attackers are using it, so patch it first.
What it is
An out of bounds write exists in FreeType versions 2.13.0 and below (newer versions of FreeType are not vulnerable) when attempting to parse font subglyph structures related to TrueType GX and variable font files. The vulnerable code assigns a signed short value to an unsigned long and then adds a static value causing it to wrap around and allocate too small of a heap buffer. The code then writes up to 6 signed long integers out of bounds relative to this buffer. This may result in arbitrary code execution. This vulnerability may have been exploited in the wild.
Weakness: CWE-787.
Severity
8.1 high
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Exploited (CISA KEV)
Yes, since May 6, 2025
Federal due date May 27, 2025
EPSS, next 30 days
28%
Higher than 98% of scored CVEs
How it can be exploited
- Attack vector
- Network
- Attack complexity
- High
- Privileges required
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality impact
- High
- Integrity impact
- High
- Availability impact
- High
What CISA says to do
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Affected products
FreeType. NVD's record lists the exact affected versions.
References
- www.facebook.com/security/advisories/cve-2025-27363 Third Party Advisory
- lists.debian.org/debian-lts-announce/2025/03/msg00030.html Mailing List
- source.android.com/docs/security/bulletin/2025-05-01 Third Party Advisory
- www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-27363 US Government Resource
Questions
Is CVE-2025-27363 being exploited?
Yes. CISA added CVE-2025-27363 to its Known Exploited Vulnerabilities catalog on 2025-05-06, with a federal remediation due date of 2025-05-27.
How do I fix CVE-2025-27363?
CISA's required action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
From NVD, CISA KEV, FIRST EPSS and OSV.dev, checked . Status on NVD: Analyzed. The description is NVD's text, quoted as published.
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