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Vulnerability record · CVE-2021-21702 · published 15 February 2021

CVE-2021-21702: Php null pointer dereference vulnerability

Php · Php

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.

7.5 CVSS 3.1 High EPSS 3.2% · top 12.4% CWE-476 · NULL pointer dereference
7.5CVSS 3.1 base score, v2 5.0
3.2%EPSS exploitation probability, 30 days
NoNot in CISA KEV
4Affected product versions listed by NVD
14References
17 Jun 2026Last modified by NVD

Description

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

4 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://bugs.php.net/bug.php?id=80672 Issue TrackingVendor Advisory
https://lists.debian.org/debian-lts-announce/2021/07/msg00008.html Mailing ListThird Party Advisory
https://security.gentoo.org/glsa/202105-23 Third Party Advisory
https://security.netapp.com/advisory/ntap-20210312-0005/ Third Party Advisory
https://www.debian.org/security/2021/dsa-4856 Third Party Advisory
https://www.oracle.com/security-alerts/cpuoct2021.html PatchThird Party Advisory
https://www.tenable.com/security/tns-2021-14 Third Party Advisory
https://bugs.php.net/bug.php?id=80672 Issue TrackingVendor Advisory
https://lists.debian.org/debian-lts-announce/2021/07/msg00008.html Mailing ListThird Party Advisory
https://security.gentoo.org/glsa/202105-23 Third Party Advisory
https://security.netapp.com/advisory/ntap-20210312-0005/ Third Party Advisory
https://www.debian.org/security/2021/dsa-4856 Third Party Advisory
https://www.oracle.com/security-alerts/cpuoct2021.html PatchThird Party Advisory
https://www.tenable.com/security/tns-2021-14 Third Party Advisory

Track CVE-2021-21702 inside VULONE

Watch it alongside the ransomware crews, C2 infrastructure and forum chatter that reference it, query it through the API and pull it into your SIEM over TAXII.

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Source: NIST National Vulnerability Database (record CVE-2021-21702), CISA KEV, FIRST EPSS (scores of 2026-09-29). This page is refreshed as NVD updates the record.