CVE-2024-6143: Actiontec WCB6200Q uh_tcp_recv_header Buffer Overflow Remote Code Execution Vulnerability

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HIGH 8.8MITIGATE

CVE-2024-6143 is a high-severity flaw (CVSS 8.8) affecting wcb6200q firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Actiontec WCB6200Q uh_tcp_recv_header Buffer Overflow Remote Code Execution Vulnerability. This vulnerability allows network-adjacent attackers to execute arbitrary code on affected installations of Actiontec WCB6200Q routers. Authentication is not required to exploit this vulnerability. The specific flaw exists within the HTTP server. The issue results from the lack of proper validation of the length of user-supplied data prior to copying it to

Why this priority

High severity

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	8.8 (High)
Attack vector	Adjacent network
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.1% (top 34%)
CISA exploited list	No
Weakness	CWE-120
Published	2024-06-19
Last modified	2026-06-17

Publisher (CNA): Zero Day Initiative · Vendor: actiontec

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2024-06-19 00:15 UTCPublished CVE record published
2026-06-17 08:17 UTCUpdated Record last modified

actiontec wcb6200q firmware MITIGATE

Affected: 1.2l.03.5

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.2l.03.5

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2024-6143?

wcb6200q firmware: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2024-6143 being exploited?

CVE-2024-6143 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2024-6143 affect?

CVE-2024-6143 affects wcb6200q firmware. Severity is high (CVSS 8.8). Actiontec WCB6200Q uh_tcp_recv_header Buffer Overflow Remote Code Execution Vulnerability. This vulnerability allows network-adjacent attackers to execute arbitrary code on affected installations of Actiontec WCB6200Q routers. Authenticatio

How urgent is CVE-2024-6143?

Priority 47/100. High severity

Related CVEs

CVE-2024-6146 HIGH 8.8 MITIGATE Actiontec WCB6200Q uh_get_postdata_withupload Stack-based Buffer Overflow Remote Code Execution Vulnerability
CVE-2024-6145 HIGH 8.8 MITIGATE Actiontec WCB6200Q Cookie Format String Remote Code Execution Vulnerability
CVE-2024-6144 HIGH 8.8 MITIGATE Actiontec WCB6200Q Multipart Boundary Stack-based Buffer Overflow Remote Code Execution Vulnerability
CVE-2024-6142 HIGH 8.8 MITIGATE Actiontec WCB6200Q uh_tcp_recv_content Buffer Overflow Remote Code Execution Vulnerability

References

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