CVE-2025-6491
MEDIUMCVSS v3
5.9
MEDIUM
EPSS Score
0.8%
exploit probability
CISA KEV
No
known exploited
Exploitation
—
SSVC status
Description
In PHP versions:8.1.* before 8.1.33, 8.2.* before 8.2.29, 8.3.* before 8.3.23, 8.4.* before 8.4.10 when parsing XML data in SOAP extensions, overly large (>2Gb) XML namespace prefix may lead to null pointer dereference. This may lead to crashes and affect the availability of the target server.
Technical Details
- CVSS v3 Vector
- 3.1
- Published
- 7/13/2025
- Last Modified
- 11/4/2025
Frequently Asked Questions
What is CVE-2025-6491?
In PHP versions:8.1.* before 8.1.33, 8.2.* before 8.2.29, 8.3.* before 8.3.23, 8.4.* before 8.4.10 when parsing XML data in SOAP extensions, overly large (>2Gb) XML namespace prefix may lead to null pointer dereference. This may lead to crashes and affect the availability of the target server.
Is CVE-2025-6491 actively exploited?
Active exploitation of CVE-2025-6491 has not been confirmed. The EPSS score is 0.8%, indicating the estimated probability of exploitation in the next 30 days.
What is the CVSS score for CVE-2025-6491?
CVE-2025-6491 has a CVSS v3 base score of 5.9 (MEDIUM severity), with vector string 3.1.
Is CVE-2025-6491 affecting your environment?
Use isMalicious to check if any of your IPs or domains are associated with this vulnerability's IOCs.