spx_restservice Login_handler_func Command Injection and Multiple Stack-Based Buffer Overflows

published 2022-10-24 4 y ago modified 2026-06-17 4 mo ago also EUVD-2021-13516

cvss: 10.0; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 2.7%; EPSS 2.7% chance of exploitation in 30 days, percentile 85%
public exploits: 0; none known

Command injection and multiple stack-based buffer overflows vulnerabilities in the Login_handler_func function of spx_restservice allow 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.

CISA SSVC

Exploitation: none
Automatable: no
Technical impact: total
Assessed: 18 mo ago (2025-05-07)

Exploit prediction

2.65% chance of exploitation in the next 30 days, higher than 85% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.1	10.0	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
NVD	3.1	9.8	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

Lanner Inc IAC-AST2500A

Classification

Weakness

CWE-94 Improper Control of Generation of Code
CWE-121 Stack-based Buffer Overflow
CWE-77 Improper Neutralization of Special Elements used in a Command
CWE-787 Out-of-bounds Write

References

nozominetworks.com /blog/vulnerabilities-in-bmc-firmware-affect-ot-iot-device-security-part-1/
third-party-advisory
nozominetworks.com /labs/vulnerability-advisories/cve-2021-26729/
third-party-advisory

Sources

CVE List CVE-2021-26729
NVD CVE-2021-26729

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Summary