🛡️ CVE-2022-26642 — tl-wr840n-firmware

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs administrative privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality high, integrity high, availability high.

CVSS metrics in full

The score comes from this vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

• Attack vector: Network — reachable from anywhere that can route to the service.
• Attack complexity: Low — the attack works reliably, with no preparation.
• Privileges required: High — administrative rights are needed first.
• User interaction: None — nobody has to be tricked into anything.
• Scope: Unchanged — the damage stays inside the vulnerable component.
• Confidentiality impact: High — total loss, or loss the attacker controls.
• Integrity impact: High — total loss, or loss the attacker controls.
• Availability impact: High — total loss, or loss the attacker controls.

Weakness class

CVE-2022-26642 is classified as CWE-120: Classic Buffer Overflow. Input is copied into a fixed-size buffer without a length check, overwriting memory past the end of it.

Affected software

CVE-2022-26642 is recorded against 1 package.

• tl-wr840n-firmware

Timeline and source

Published on 28 March 2022 and last revised on 17 June 2026. A public exploit is known to exist, which raises the urgency of patching considerably. Record sourced from NVD.

References

github.com
github.com

Other advisories for this package

tl-wr840n-firmware has other advisories on record. If you are patching this one, these are worth checking on the same host:

• CVE-2026-3227 (6.8 Medium, published 16 Mar 2026)
• CVE-2023-39471 (8.8 High, published 3 May 2024)
• CVE-2022-29402 (6.8 Medium, published 25 May 2022)
• CVE-2022-26639 (7.2 High, published 28 Mar 2022)
• CVE-2022-26641 (7.2 High, published 28 Mar 2022)
• CVE-2022-26640 (7.2 High, published 28 Mar 2022)
• CVE-2022-25064 (9.8 Critical, published 25 Feb 2022)
• CVE-2022-25062 (7.5 High, published 25 Feb 2022)

Same weakness in other software

These advisories are the same class of weakness (CWE-120: Classic Buffer Overflow) in other software:

• CVE-2019-5064 (8.0 High, published 9 Jul 2026)
• CVE-2022-29210 (5.0 Medium, published 6 Jul 2026)
• CVE-2021-41499 (8.0 High, published 2 Jul 2026)
• CVE-2022-29974 (4.3 Medium, published 9 Dec 2024)
• CVE-2022-20846 (4.3 Medium, published 15 Nov 2024)
• CVE-2022-32504 (9.8 Critical, published 14 May 2024)
• CVE-2022-24807 (6.5 Medium, published 16 Apr 2024)
• CVE-2022-24805 (6.5 Medium, published 16 Apr 2024)

Details

Affected Packages

References