CVE-2020-25725
Quick assessment
Affected
Glyph & Cog xpdf
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
Xpdf是Foo实验室的一款开源的PDF阅读器。该产品支持解码LZW压缩格式的文件以及阅读加密的PDF文件。 Xpdf 4.02 存在安全漏洞，该漏洞源于 SplashOutputDev::endType3Char(GfxState *state) SplashOutputDev.cc:3079 尝试使用 ，这就导致了“免堆后使用”的问题。以前针对嵌套类型3字符的修复代码没有正确处理类型3字符引用相同类型3字体的另一个字符的情况。
Possible ATT&CK Techniques 1 AI
T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2020-25725
Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
释放后使用
Source: CVE Program / CVE List V5
Vulnerability Title
Xpdf 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Xpdf是Foo实验室的一款开源的PDF阅读器。该产品支持解码LZW压缩格式的文件以及阅读加密的PDF文件。 Xpdf 4.02 存在安全漏洞，该漏洞源于 SplashOutputDev::endType3Char(GfxState *state) SplashOutputDev.cc:3079 尝试使用 `t3GlyphStack->cache`，这就导致了“免堆后使用”的问题。以前针对嵌套类型3字符的修复代码没有正确处理类型3字符引用相同类型3字体的另一个字符的情况。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| Glyph & Cog | xpdf | 4.02 | - |
|
II. Public POCs for CVE-2020-25725
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POC
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Vendor Advisories for CVE-2020-25725 (1)
-
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2020-25725 x_refsource_CONFIRM
Mailing List Discussions for CVE-2020-25725 (2)
-
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4ZUU5QG6SSVRTKZTR3A72LDRVZETEI63/ vendor-advisory x_refsource_FEDORA
-
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VLOYVJSM54IL6I5RY4QTJGRS7PIEG44X/ vendor-advisory x_refsource_FEDORA
Other References for CVE-2020-25725 (1)
-
https://forum.xpdfreader.com/viewtopic.php?f=3&t=41915 x_refsource_MISC
IV. Related Vulnerabilities
Same product: xpdf
-
CVE-2026-85458
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CVE-2025-3154
Out-of-bounds array write due to invalid VerticesPerRow in X -
CVE-2025-2574
Out-of-bounds array write in Xpdf 4.05 due to incorrect inte
Same weakness: CWE-416
-
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V. Comments for CVE-2020-25725
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