EUVD-2026-62242Severity by source
AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
S:C chosen because successful exploitation in the ipfw path yields kernel execution, crossing from user/natd authority into kernel security scope.
Primary rating from Vendor (freebsd).
CVSS VectorVendor: freebsd
Lifecycle Timeline
3DescriptionCVE.org
The RTSP handler in libalias rewrote outgoing packets into a fixed-length stack buffer without checking whether the rewritten data fit in the buffer, or whether the result fit back in the original packet.
A host sending crafted RTSP traffic from inside a NAT gateway using libalias can overflow a stack buffer, potentially achieving remote code execution in the kernel (when using ipfw(4) NAT) or in the natd(8) process (which generally runs as the root user).
AnalysisAI
Stack-based buffer overflow in FreeBSD's libalias RTSP handler exposes NAT gateways to kernel-level or root-level remote code execution from hosts inside the NAT perimeter. The RTSP protocol rewriter copies rewritten packet data into a fixed-size stack buffer with no length validation, allowing a crafted RTSP stream to overflow that buffer. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the attacker to control a host located on the inside (LAN-facing) interface of a FreeBSD NAT gateway running an unpatched version of libalias. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 8.8 score reflects an adjacent-network, unauthenticated, no-interaction attack with full confidentiality, integrity, and availability impact - a profile that warrants urgent triage for any organization operating FreeBSD NAT gateways. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | The primary remediation is to apply the vendor-released patches corresponding to the installed FreeBSD release: upgrade to FreeBSD 14.3-RELEASE-p16, 14.4-RELEASE-p7, 15.0-RELEASE-p11, or 15.1-RELEASE-p1 as appropriate. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all production FreeBSD systems running NAT services via ipfw(4) or natd(8), and determine whether RTSP protocol rewriting is actively enabled and required for business operations. …
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Same weakness CWE-121 – Stack-based Buffer Overflow
View allSame technique Stack Overflow
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External POC / Exploit Code
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