CVE-2021-21702
HIGHCVSS 7.5/10EPSS 3.09%
Last modified
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/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
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
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2021-21702?
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.
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.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
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Are you affected by CVE-2021-21702?
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