CVE-2021-21702: Debian Linux

High severity, CVSS 7.5. EPSS: 3.2% chance of exploitation in the next 30 days.

In PHP versions 7.3.x below 7.3.27, 7.4.x below 7.4.15 and 8.0.x below 8.0.2, when using SOAP extension to connect to a SOAP server, a malicious SOAP server could return malformed XML data as a response that would cause PHP to access a null pointer and thus cause a crash.

Affected products

• Debian Debian Linux: version 9.0 only; version 10.0 only
• Netapp Clustered Data Ontap: affected versions not specified
• Oracle Communications Diameter Signaling Router: from 8.0.0, up to and including 8.5.0
• PHP PHP: from 7.3.0, before 7.3.27 (fixed in 7.3.27); from 7.4.0, before 7.4.15 (fixed in 7.4.15); from 8.0.0, before 8.0.2 (fixed in 8.0.2)

Published 2021-02-15. Last modified 2026-06-17.