Is CVE-2021-26730 actively exploited?

No active exploitation of CVE-2021-26730 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2021-26730 be exploited remotely?

Yes. CVE-2021-26730 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2021-26730?

CVE-2021-26730 has a CVSS score of 9.8 (CRITICAL).

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CRITICAL

CVE-2021-26730

CWE-121Published: October 24, 2022· Updated: Jun 17, 2026

9.8

CVSS v3.1

Official Description

A stack-based buffer overflow vulnerability in a subfunction of the Login_handler_func function of spx_restservice allows an 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

A stack-based buffer overflow in the Lanner Inc IAC-AST2500A firmware's login handler allows an attacker to execute arbitrary code with root privileges. The 9.8 CVSS score marks this as a critical security flaw.

No public exploit is 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 address this buffer overflow.

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-2021-26730 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.