What’s Vulnerable › Vulnerabilities

CVE-2020-25725

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.0% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2020-11-21 · updated 2026-06-17
• Weakness: CWE-416

Description

In Xpdf 4.02, SplashOutputDev::endType3Char(GfxState *state) SplashOutputDev.cc:3079 is trying to use the freed `t3GlyphStack->cache`, which causes an `heap-use-after-free` problem. The codes of a previous fix for nested Type 3 characters wasn't correctly handling the case where a Type 3 char referred to another char in the same Type 3 font.

Affected products

• Fedoraproject Fedora: 32, 33
• Xpdf: 4.02

References

• https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2020-25725
• https://forum.xpdfreader.com/viewtopic.php?f=3&t=41915
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4ZUU5QG6SSVRTKZTR3A72LDRVZETEI63/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VLOYVJSM54IL6I5RY4QTJGRS7PIEG44X/
• https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2020-25725
• https://forum.xpdfreader.com/viewtopic.php?f=3&t=41915
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4ZUU5QG6SSVRTKZTR3A72LDRVZETEI63/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VLOYVJSM54IL6I5RY4QTJGRS7PIEG44X/

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