CVE-2021-20090
Last modified
CVE-2021-20090 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. A path traversal vulnerability in the web interfaces of Buffalo WSR-2533DHPL2 firmware version <= 1.02 and WSR-2533DHP3 firmware version <= 1.24 could allow unauthenticated remote attackers to bypass authentication.. CISA has confirmed active exploitation in the wild. EPSS estimates a 99.98% chance of exploitation in the next 30 days.
Description
A path traversal vulnerability in the web interfaces of Buffalo WSR-2533DHPL2 firmware version <= 1.02 and WSR-2533DHP3 firmware version <= 1.24 could allow unauthenticated remote attackers to bypass authentication.
Metrics
Exploitation Status
This vulnerability is listed in CISA’s Known Exploited Vulnerabilities catalog, confirming active exploitation in the wild. Federal agencies must remediate by .
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Buffalo | Wsr-2533dhpl2-Bk Firmware | <= 1.02 |
| Buffalo | Wsr-2533dhp3-Bk Firmware | <= 1.24 |
References
- https://www.kb.cert.org/vuls/id/914124Third Party Advisory, US Government Resource
- https://www.secpod.com/blog/arcadyan-based-routers-and-modems-under-active-exploitation/Exploit, Third Party Advisory
- https://www.tenable.com/security/research/tra-2021-13Exploit, Third Party Advisory
- https://www.kb.cert.org/vuls/id/914124Third Party Advisory, US Government Resource
- https://www.secpod.com/blog/arcadyan-based-routers-and-modems-under-active-exploitation/Exploit, Third Party Advisory
- https://www.tenable.com/security/research/tra-2021-13Exploit, Third Party Advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-20090US Government Resource
Timeline
- Published
- Last Modified
- Status
- Analyzed
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How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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