Service crash via unchecked SOAP child name
Published Feb 15, 2021 · Updated Sep 16, 2024
Null pointer dereference in The PHP Group PHP SOAP before 7.3.27, 7.4.15, and 8.0.2 allows remote attackers to crash PHP via malformed XML. The node_is_equal_ex function passes an absent XML child-node name to strcmp without first checking node->name for null. Exploitation requires the SOAP extension to act as a client of an attacker-controlled SOAP server; the malformed response terminates the affected PHP process.
Summary
What happened
Null pointer dereference in The PHP Group PHP SOAP before 7.3.27, 7.4.15, and 8.0.2 allows remote attackers to crash PHP via malformed XML. The node_is_equal_ex function passes an absent XML child-node name to strcmp without first checking node->name for null. Exploitation requires the SOAP extension to act as a client of an attacker-controlled SOAP server; the malformed response terminates the affected PHP process.
The record
- CVE
- CVE-2021-21702
- Published
- Feb 15, 2021
- Updated
- Sep 16, 2024
- Vendor
- The PHP Group
- Product
- PHP
- Classifications
- CWE-476, T1499
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Feb 15, 2021CVE publishedPublication date reported by the CVE source.
- Sep 16, 2024Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=7.3.x <7.3.27
- Affected versionversion=7.4.x <7.4.15
- Affected versionversion=8.0.X <8.0.2
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Public exploit references
- SoapClient malformed XML crash reproducerproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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