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CVE

CVE-2026-53581

ntp: write path traversal
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CVE

CVE-2026-53581

ntp: write path traversal

OPNsense is a FreeBSD based firewall and routing platform. Prior to version 26.1.9 of opnsense/core and version 26.420 of BE/opnsense/core, a path traversal vulnerability in the NTP configuration module allows an attacker to overwrite arbitrary files on the system as the root user. By manipulating the GPS or PPS serial port parameter, an attacker with access to the NTP configuration can escape the intended directory and force the system to write user-controlled data to any file on the filesystem. Version 26.1.9 of opnsense/core and version 26.420 of BE/opnsense/core patch the issue.

Package Versions Affected

Package Version
patch Availability
No items found.

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CVSS Version

Severity
Base Score
CVSS Version
Score Vector
C
H
U
9
-
3.1
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:L/A:H
C
H
U
0
-
3.1
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:L/A:H
C
H
U
-

Related Resources

No items found.

References

https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53581.json, https://github.com/opnsense/core/security/advisories/GHSA-872g-g543-j37m, https://nvd.nist.gov/vuln/detail/CVE-2026-53581

Severity

9

CVSS Score
0
10

Basic Information

Base CVSS
9
EPSS Probability
0.00473%
EPSS Percentile
0.38948%
Introduced Version
0
Fix Available
b11d6b340716e240868ab19a369e058a46f0876f

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