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Vulnerability record · CVE-2022-43970 · published 9 January 2023

CVE-2022-43970: Linksys wrt54gl firmware classic buffer overflow vulnerability

Linksys · Wrt54gl Firmware

A buffer overflow vulnerability exists in Linksys WRT54GL Wireless-G Broadband Router with firmware <= 4.30.18.006. A stack-based buffer overflow in the Start_EPI function within the httpd binary allows an authenticated attacker with administrator privileges to execute arbitrary commands on the underlying Linux operating system as root. This vulnerablity can be triggered over the network via a malicious POST request to /apply.cgi.

7.2 CVSS 3.1 High EPSS 19% · top 2.7% CWE-120 · Classic buffer overflowCWE-787 · Out-of-bounds write
7.2CVSS 3.1 base score
19%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
6References, 6 tagged exploit
17 Jun 2026Last modified by NVD

Description

A buffer overflow vulnerability exists in Linksys WRT54GL Wireless-G Broadband Router with firmware <= 4.30.18.006. A stack-based buffer overflow in the Start_EPI function within the httpd binary allows an authenticated attacker with administrator privileges to execute arbitrary commands on the underlying Linux operating system as root. This vulnerablity can be triggered over the network via a malicious POST request to /apply.cgi.

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://youtu.be/73-1lhvJPNg ExploitThird Party Advisory
https://youtu.be/RfWVYCUBNZ0 ExploitThird Party Advisory
https://youtu.be/TeWAmZaKQ_w ExploitThird Party Advisory
https://youtu.be/73-1lhvJPNg ExploitThird Party Advisory
https://youtu.be/RfWVYCUBNZ0 ExploitThird Party Advisory
https://youtu.be/TeWAmZaKQ_w ExploitThird Party Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

7.5CVE-2024-1404Linksys wrt54gl firmware information exposure vulnerabilityA vulnerability was found in Linksys WRT54GL 4.30.18 and classified as problematic. Affected by this issue is some unknown functionality of the file …EPSS 0.77%7.5CVE-2022-43972Linksys wrt54gl firmware null pointer dereference vulnerabilityA null pointer dereference vulnerability exists in Linksys WRT54GL Wireless-G Broadband Router with firmware <= 4.30.18.006. A null pointer dereferen…EPSS 1.3%7.2CVE-2023-31742Linksys wrt54gl firmware command injection vulnerabilityThere is a command injection vulnerability in the Linksys WRT54GL router with firmware version 4.30.18.006. If an attacker gains web management privi…EPSS 9.1%7.2CVE-2022-43973Linksys wrt54gl firmware os command injection vulnerabilityAn arbitrary code execution vulnerability exisits in Linksys WRT54GL Wireless-G Broadband Router with firmware <= 4.30.18.006. The Check_TSSI functio…EPSS 1.9%4.3CVE-2024-1406Linksys wrt54gl firmware information exposure vulnerabilityA vulnerability was found in Linksys WRT54GL 4.30.18. It has been declared as problematic. This vulnerability affects unknown code of the file /SysIn…EPSS 0.48%4.3CVE-2024-1405Linksys wrt54gl firmware information exposure vulnerabilityA vulnerability was found in Linksys WRT54GL 4.30.18. It has been classified as problematic. This affects an unknown part of the file /wlaninfo.htm o…EPSS 0.36%5.5CVE-2025-43520Apple OS kernel memory corruption via malicious appA memory corruption flaw (classic buffer overflow) in Apple's kernel was fixed across iOS, iPadOS, macOS, tvOS, visionOS and watchOS. A malicious app…KEVEPSS 0.43%analysed8.8CVE-2025-31277Apple WebKit memory corruption via malicious web contentApple WebKit fails to handle memory correctly when processing crafted web content, leading to memory corruption across Safari, iOS, iPadOS, macOS, tv…KEVEPSS 1.6%analysed

Source: NIST National Vulnerability Database (record CVE-2022-43970), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.