CVE-2025-27363

CVE-2025-27363 is a high-severity vulnerability in Freetype with a CVSS 3.x base score of 8.1. It is listed in CISA's Known Exploited Vulnerabilities (KEV) catalog, confirming it has been exploited in the wild (added 2025-05-06). The underlying weakness is classified as CWE-787.

Key facts

• Severity: High (CVSS 3.x base score 8.1)
• EPSS exploit prediction: 26% (98th percentile)
• Actively exploited: Yes — listed in CISA KEV (added 2025-05-06)
• EU (EUVD) id: EUVD-2025-6367
• EU exploitation: Flagged exploited in the ENISA EU Vulnerability Database (since 2025-05-06)
• Weakness: CWE-787
• Affected product: Freetype
• Published: 2025-03-11
• Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is CVE-2025-27363?

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.

How severe is CVE-2025-27363?

CVE-2025-27363 has a CVSS 3.x base score of 8.1, rated high severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2025-27363 being actively exploited?

Yes. CVE-2025-27363 is on CISA's Known Exploited Vulnerabilities (KEV) catalog, added on 2025-05-06, which means active exploitation has been confirmed. It should be prioritised for remediation.

What products are affected by CVE-2025-27363?

CVE-2025-27363 primarily affects Freetype. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2025-27363?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Because this CVE is known to be actively exploited, treat remediation as urgent — CISA KEV typically sets a short remediation deadline.

Does CVE-2025-27363 have an EU (EUVD) identifier?

Yes. CVE-2025-27363 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-6367. It is also flagged as exploited in the EUVD (since 2025-05-06).

When was CVE-2025-27363 published?

CVE-2025-27363 was published on 2025-03-11 and last updated on 2026-06-17.

References

• https://www.facebook.com/security/advisories/cve-2025-27363
• http://www.openwall.com/lists/oss-security/2025/03/13/1
• http://www.openwall.com/lists/oss-security/2025/03/13/11
• http://www.openwall.com/lists/oss-security/2025/03/13/12
• http://www.openwall.com/lists/oss-security/2025/03/13/2
• http://www.openwall.com/lists/oss-security/2025/03/13/3
• http://www.openwall.com/lists/oss-security/2025/03/13/8
• http://www.openwall.com/lists/oss-security/2025/03/14/1
• http://www.openwall.com/lists/oss-security/2025/03/14/2
• http://www.openwall.com/lists/oss-security/2025/03/14/3
• http://www.openwall.com/lists/oss-security/2025/03/14/4
• http://www.openwall.com/lists/oss-security/2025/05/06/3
• http://www.openwall.com/lists/oss-security/2026/04/16/5
• http://www.openwall.com/lists/oss-security/2026/04/19/3
• https://lists.debian.org/debian-lts-announce/2025/03/msg00030.html
• https://source.android.com/docs/security/bulletin/2025-05-01
• https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-27363

Affected products (2)

• cpe:2.3:a:freetype:freetype:*:*:*:*:*:*:*:*
• cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*

More vulnerabilities in Freetype

• CVE-2012-1126 — Critical (CVSS 10.0): FreeType before 2.4.9, as used in Mozilla Firefox Mobile before 10.0.4 and other products, allows remote attackers to…
• CVE-2022-27404 — Critical (CVSS 9.8): FreeType commit 1e2eb65048f75c64b68708efed6ce904c31f3b2f was discovered to contain a heap buffer overflow via the…
• CVE-2015-9290 — Critical (CVSS 9.8): In FreeType before 2.6.1, a buffer over-read occurs in type1/t1parse.c on function T1_Get_Private_Dict where there is…
• CVE-2017-8287 — Critical (CVSS 9.8): FreeType 2 before 2017-03-26 has an out-of-bounds write caused by a heap-based buffer overflow related to the…
• CVE-2017-8105 — Critical (CVSS 9.8): FreeType 2 before 2017-03-24 has an out-of-bounds write caused by a heap-based buffer overflow related to the…
• CVE-2017-7864 — Critical (CVSS 9.8): FreeType 2 before 2017-02-02 has an out-of-bounds write caused by a heap-based buffer overflow related to the…

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