CVE-2021-26730

spx_restservice Login_handler_func Subfunction Stack-Based Buffer Overflow

10.0 Critical

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.

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: None

What an attacker can affect

Confidentiality: High
Integrity: High
Availability: High

Exploit likelihood

1.30%Up 0.2 points since Oct 25, 2022

What each source reports

CVE List Score used 10.0

spx_restservice Login_handler_func Subfunction Stack-Based Buffer Overflow

Record: CVE-2021-26730
CVSS 3.1: 10.0 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Weakness: CWE-121
Updated: 2026-11-02

EUVDEUVD-2021-13517 10.0

Record: EUVD-2021-13517
CVSS 3.1: 10.0 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Updated: 2026-11-02

GitHub AdvisoriesGHSA-wj6f-q7qm-jq4x 9.8

A stack-based buffer overflow vulnerability in a subfunction of the Login_handler_func function...

Record: GHSA-wj6f-q7qm-jq4x
CVSS 3.1: 9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness: CWE-787
Updated: 2026-11-02

NVD 10.0

Record: CVE-2021-26730
CVSS 3.1: 10.0 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
CVSS 3.1: 9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness: CWE-121, CWE-787
Updated: 2026-11-02

Affected products

History

History
Recorded	Changed	Sources
Nov 2, 2026	first indexed	CVE List, EUVD, GitHub Advisories, NVD

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2021-26730 is a critical vulnerability (CVSS 10.0) in Lanner Inc Iac-ast2500a, published October 24, 2022. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.30%, the 70th percentile. No source names a fixed version.