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PHP CVEs

Vulnerabilities in the PHP language itself, and which PHP versions they affect.

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CVE-2021-21707

MEDIUM 5.3 CVSS 3.1
Published
November 29, 2021
Last modified
June 17, 2026
NVD status
Modified
Reported by
security@php.net
Weakness
CWE-159
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Description

In PHP versions 7.3.x below 7.3.33, 7.4.x below 7.4.26 and 8.0.x below 8.0.13, certain XML parsing functions, like simplexml_load_file(), URL-decode the filename passed to them. If that filename contains URL-encoded NUL character, this may cause the function to interpret this as the end of the filename, thus interpreting the filename differently from what the user intended, which may lead it to reading a different file than intended.

Affected products and versions

  • PHP — From 7.3.0 (including) to 7.3.33 (excluding)
  • PHP — From 7.4.0 (including) to 7.4.26 (excluding)
  • PHP — From 8.0.0 (including) to 8.0.13 (excluding)

References

  • bugs.php.net https://bugs.php.net/bug.php?id=79971 Exploit, Issue Tracking, Patch, Release Notes, Vendor Advisory
  • lists.debian.org https://lists.debian.org/debian-lts-announce/2022/12/msg00030.html Issue Tracking, Mailing List
  • security.netapp.com https://security.netapp.com/advisory/ntap-20211223-0005/ Third Party Advisory
  • www.debian.org https://www.debian.org/security/2022/dsa-5082 Third Party Advisory
  • www.tenable.com https://www.tenable.com/security/tns-2022-09 Patch, Release Notes, Third Party Advisory
  • nvd.nist.gov Official NVD record