🛡️ CVE-2022-21809 — inrouter302-firmware

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs low-level privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality none, integrity high, availability high.

CVSS metrics in full

The score comes from this vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/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: Low — an ordinary user account is enough.
• User interaction: None — nobody has to be tricked into anything.
• Scope: Unchanged — the damage stays inside the vulnerable component.
• Confidentiality impact: None.
• Integrity impact: High — total loss, or loss the attacker controls.
• Availability impact: High — total loss, or loss the attacker controls.

Weakness class

CVE-2022-21809 is classified as CWE-377: Insecure Temporary File. Creating and using insecure temporary files can leave application and system data vulnerable to attack.

Affected software

CVE-2022-21809 is recorded against 1 package.

• inrouter302-firmware (fixed in 3.5.37)

Timeline and source

Published on 12 May 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

talosintelligence.com
www.inhandnetworks.com
talosintelligence.com
www.inhandnetworks.com

Other advisories for this package

inrouter302-firmware has other advisories on record. If you are patching this one, these are worth checking on the same host:

• CVE-2023-22598 (7.2 High, published 12 Jan 2023)
• CVE-2023-22597 (6.5 Medium, published 12 Jan 2023)
• CVE-2023-22601 (10.0 Critical, published 12 Jan 2023)
• CVE-2023-22600 (10.0 Critical, published 12 Jan 2023)
• CVE-2023-22599 (7.0 High, published 12 Jan 2023)
• CVE-2022-25932 (9.8 Critical, published 9 Nov 2022)
• CVE-2022-21238 (6.1 Medium, published 12 May 2022)
• CVE-2022-21182 (8.8 High, published 12 May 2022)

Same weakness in other software

These advisories are the same class of weakness (CWE-377: Insecure Temporary File) in other software:

• CVE-2026-53759 (2.0 Low, published 18 Aug 2026)
• CVE-2026-16791 (3.9 Low, published 4 Aug 2026)
• CVE-2026-44878 (7.2 High, published 21 Jul 2026)
• CVE-2025-7707 (8.0 High, published 7 Jul 2026)
• CVE-2026-35342 (2.0 Low, published 6 Jul 2026)
• CVE-2026-41991 (4.7 Medium, published 29 Jun 2026)
• CVE-2026-41001 (5.3 Medium, published 11 Jun 2026)
• CVE-2026-49134 (7.1 High, published 1 Jun 2026)

Details

Affected Packages

References