UpHeron
All vulnerabilities

Servers and applications

CVE-2021-21704

In PHP versions 7.3.x below 7.3.29, 7.4.x below 7.4.21 and 8.0.x below 8.0.8, when using Firebird PDO driver extension, a malicious database server could cause crashes in various database functions, such as getAttribute(), execute(), fetch() and others by returning invalid response data that is not parsed correctly by the driver. This can result in crashes, denial of service or potentially…

Severity
Medium 5.9
Published
4 Oct 2021
Last changed
17 Jun 2026
Added to UpHeron
14 Oct 2026
Fixed in
7.3.29, 7.4.21, 8.0.8
Sources
NVD

Affected software

SoftwareAffected versions
PHPServers and applications · cpe:a:php:php
  • From 7.3.0 before 7.3.29
  • From 7.4.0 before 7.4.21
  • From 8.0.0 before 8.0.8

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2021-21704
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2021-21704