How severe is CVE-2025-15277?

CVE-2025-15277 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2025-15277 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (17th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-15277?

CVE-2025-15277 affects Fontforge. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-15277?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2025-15277 have an EU (EUVD) identifier?

Yes. CVE-2025-15277 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-205889.

When was CVE-2025-15277 published?

CVE-2025-15277 was published on 2025-12-31 and last updated on 2026-06-17.

CVE-2025-15277

CVE-2025-15277 is a high-severity vulnerability in Fontforge with a CVSS 3.x base score of 7.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-122.

Key facts

Severity: High (CVSS 3.x base score 7.8)
EPSS exploit prediction: 0% (17th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-205889
Weakness: CWE-122
Affected product: Fontforge
Published: 2025-12-31
Last modified: 2026-06-17

Description

FontForge GUtils SGI File Parsing Heap-based Buffer Overflow Remote Code Execution Vulnerability. This vulnerability allows remote attackers to execute arbitrary code on affected installations of FontForge. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file. The specific flaw exists within the parsing of scanlines within SGI files. The issue results from the lack of proper validation of the length of user-supplied data prior to copying it to a heap-based buffer. An attacker can leverage this vulnerability to execute code in the context of the current process. Was ZDI-CAN-27920.

Frequently asked questions

What is CVE-2025-15277?: FontForge GUtils SGI File Parsing Heap-based Buffer Overflow Remote Code Execution Vulnerability. This vulnerability allows remote attackers to execute arbitrary code on affected installations of FontForge. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file. The specific flaw exists within the parsing of scanlines within SGI files. The issue results from the lack of proper validation of the length of user-supplied data prior to copying it to a heap-based buffer. An attacker can leverage this vulnerability to execute code in the context of the current process. Was ZDI-CAN-27920.
How severe is CVE-2025-15277?: CVE-2025-15277 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2025-15277 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (17th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-15277?: CVE-2025-15277 affects Fontforge. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-15277?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2025-15277 have an EU (EUVD) identifier?: Yes. CVE-2025-15277 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-205889.
When was CVE-2025-15277 published?: CVE-2025-15277 was published on 2025-12-31 and last updated on 2026-06-17.

References

https://www.zerodayinitiative.com/advisories/ZDI-25-1186/

Affected products (1)

cpe:2.3:a:fontforge:fontforge:20251009:*:*:*:*:*:*:*

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