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CVE-2025-64503— [BIGSLEEP-434615384] cups-filters 1.x: out of bounds write in pdftoraster

Quick assessment

Affected
OpenPrinting cups-filters
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.

OpenPrinting CUPS Filters是OpenPrinting开源的一个打印系统过滤器。 OpenPrinting CUPS Filters 1.28.18之前版本存在缓冲区错误漏洞，该漏洞源于pdftoraster工具处理PDF文件时存在数组越界写入。

CVSS 4.0 · Medium EPSS 0.21% · P11

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2025-64503

Vulnerability Information
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Vulnerability Title
[BIGSLEEP-434615384] cups-filters 1.x: out of bounds write in pdftoraster
Source: CVE Program / CVE List V5
Vulnerability Description
cups-filters contains backends, filters, and other software required to get the cups printing service working on operating systems other than macos. In cups-filters prior to 1.28.18, by crafting a PDF file with a large `MediaBox` value, an attacker can cause CUPS-Filter 1.x’s `pdftoraster` tool to write beyond the bounds of an array. First, a PDF with a large `MediaBox` width value causes `header.cupsWidth` to become large. Next, the calculation of `bytesPerLine = (header.cupsBitsPerPixel * header.cupsWidth + 7) / 8` overflows, resulting in a small value. Then, `lineBuf` is allocated with the small `bytesPerLine` size. Finally, `convertLineChunked` calls `writePixel8`, which attempts to write to `lineBuf` outside of its buffer size (out of bounds write). In libcupsfilters, the maintainers found the same `bytesPerLine` multiplication without overflow check, but the provided test case does not cause an overflow there, because the values are different. Commit 50d94ca0f2fa6177613c97c59791bde568631865 contains a patch, which is incorporated into cups-filters version 1.28.18.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存写
Source: CVE Program / CVE List V5
Vulnerability Title
OpenPrinting CUPS Filters 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
OpenPrinting CUPS Filters是OpenPrinting开源的一个打印系统过滤器。 OpenPrinting CUPS Filters 1.28.18之前版本存在缓冲区错误漏洞，该漏洞源于pdftoraster工具处理PDF文件时存在数组越界写入。
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
OpenPrinting cups-filters cups-filters < 1.28.18 -

II. Public POCs for CVE-2025-64503

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III. Intelligence Information for CVE-2025-64503

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IV. Related Vulnerabilities

Same product: cups-filters
Same vendor: OpenPrinting
Same weakness: CWE-787

V. Comments for CVE-2025-64503

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