Is CVE-2021-26731 actively exploited?

No active exploitation of CVE-2021-26731 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2021-26731 be exploited remotely?

Yes. CVE-2021-26731 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2021-26731?

CVE-2021-26731 has a CVSS score of 9.8 (CRITICAL).

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CRITICAL

CVE-2021-26731

CWE-94Published: October 24, 2022· Updated: Jun 17, 2026

9.8

CVSS v3.1

Official Description

Command injection and multiple stack-based buffer overflows vulnerabilities in the modifyUserb_func function of spx_restservice allow an authenticated attacker to execute arbitrary code with the same privileges as the server user (root). This issue affects: Lanner Inc IAC-AST2500A standard firmware version 1.10.0.

NVD Source

Risk Analysis

Lanner Inc IAC-AST2500A firmware contains command injection and buffer overflow vulnerabilities in the spx_restservice, allowing authenticated attackers to execute code as root. This critical 9.8 CVSS score highlights the risk of full system takeover.

There is no public exploit known, and it is not in the KEV. The vulnerability is remotely exploitable with low complexity.

Recommended Action

Update the IAC-AST2500A firmware to a version beyond 1.10.0 to remediate these vulnerabilities.

Generated by the CTIWATCH analysis pipeline from this CVE's metadata (CVSS, EPSS, KEV status, exploit intelligence). Verify against vendor advisories before acting.

Technical Analysis

CVE-2021-26731 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.