CVE-2021-25786: qpdf_project qpdf Use After Free

Vulnerability summary

CVE-2021-25786 is a medium (CVSS 5.3) Use After Free vulnerability in qpdf_project qpdf. EPSS estimates a 0.54% chance of exploitation in the next 30 days, higher than 44.1% of scored vulnerabilities. 1 public exploit is recorded.

Timeline

1. 11-08-2023
   PublishedVulnerability first disclosed.
2. 09-10-2024
   Last modifiedVulnerability information updated.

Description

An issue was discovered in QPDF version 10.0.4, allows remote attackers to execute arbitrary code via crafted .pdf file to Pl_ASCII85Decoder::write parameter in libqpdf.

• CWE-416Use After FreeThe product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.