CVE-2021-21702

Name: CVE-2021-21702
Creator: NVD / NIST
Published: 2021-02-15T04:15:12.673+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 3.09%

Last modified Jun 17, 2026

CVE-2021-21702 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. 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.. EPSS estimates a 3.09% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

7.5/10

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

EPSS Probability

3.09%

86.1th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Php	Php	>= 7.3.0, < 7.3.27
Php	Php	>= 7.4.0, < 7.4.15
Php	Php	>= 8.0.0, < 8.0.2
Debian	Debian Linux	9.0
Debian	Debian Linux	10.0
Netapp	Clustered Data Ontap	All versions
Oracle	Communications Diameter Signaling Router	>= 8.0.0, <= 8.5.0

References

https://bugs.php.net/bug.php?id=80672Issue Tracking, Vendor Advisory
https://lists.debian.org/debian-lts-announce/2021/07/msg00008.htmlMailing List, Third Party Advisory
https://security.gentoo.org/glsa/202105-23Third Party Advisory
https://security.netapp.com/advisory/ntap-20210312-0005/Third Party Advisory
https://www.debian.org/security/2021/dsa-4856Third Party Advisory
https://www.oracle.com/security-alerts/cpuoct2021.htmlPatch, Third Party Advisory
https://www.tenable.com/security/tns-2021-14Third Party Advisory
https://bugs.php.net/bug.php?id=80672Issue Tracking, Vendor Advisory
https://lists.debian.org/debian-lts-announce/2021/07/msg00008.htmlMailing List, Third Party Advisory
https://security.gentoo.org/glsa/202105-23Third Party Advisory
https://security.netapp.com/advisory/ntap-20210312-0005/Third Party Advisory
https://www.debian.org/security/2021/dsa-4856Third Party Advisory
https://www.oracle.com/security-alerts/cpuoct2021.htmlPatch, Third Party Advisory
https://www.tenable.com/security/tns-2021-14Third Party Advisory

Timeline

Published: Feb 15, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-21702?

How severe is CVE-2021-21702?

CVE-2021-21702 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 3.09% probability of exploitation in the next 30 days.

How do I fix CVE-2021-21702?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-21702?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST