A path traversal vulnerability in the web interfaces of Buffalo WSR-2533DHPL2 firmware version <= 1.02 and WSR-2533DHP3 firmware version <=
Affects Buffalo WSR-2533DHPL2 firmware 1.02 or earlier and WSR-2533DHP3 firmware 1.24 or earlier, and other Arcadyan-made networking devices. No fixed version is listed in the checked facts.
- Published
- Last modified
- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean? →
- published
- Whether CISA lists it in its Known Exploited Vulnerabilities catalog: proof that attackers are using it.What do these mean? →
- Listed in CISA KEV
- How many real-world setups can hit the bug, from the vendor's advisory and CISA data. It does not know your setup.What do these mean? →
- Actively exploited
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
Summary
The web management interfaces of Buffalo WSR-2533DHPL2 and WSR-2533DHP3 wireless router firmware are affected. An unauthenticated remote attacker could exploit a path traversal flaw to bypass authentication and gain access to the device's web interface.
Summarized by anthropic/claude-haiku-5.5. Verify details against the original sources.
Read the original 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.
Timeline
- CVE published
- Added to CISA KEV
CISA has evidence of exploitation in the wild
- CISA remediation deadline
Due date for US federal agencies to patch
- Record last updated
- EPSS reached 10%
FIRST estimates at least a 10% chance of exploitation in the next 30 days
Affected versions
- n/a Buffalo WSR-2533DHPL2, Buffalo WSR-2533DHP3
WSR-2533DHPL2 <=1.02, WSR-2533DHP3 <= 1.24
References 3
tenable.com
kb.cert.org
Questions about CVE-2021-20090
What does this mean?
The web interface has a path traversal flaw that lets unauthenticated remote attackers bypass the device's authentication. The root cause is in the underlying Arcadyan firmware.Source: tenable.com
Am I affected, and how do I check?
Buffalo WSR-2533DHPL2 firmware version 1.02 or earlier and WSR-2533DHP3 firmware version 1.24 or earlier are listed. Other networking devices made by Arcadyan are also affected because the flaw is in Arcadyan's firmware. Check the firmware version shown on the device's web interface.Source: tenable.com
What should I do about it?
The checked facts do not name a fixed firmware version, so no upgrade target can be given from them.Source: tenable.com
Is it being exploited?
Yes. CISA added it to its Known Exploited Vulnerabilities catalog on 2021-11-03, which means it has evidence of attacks. No public exploit code is tracked.Source: cisa.gov, cve.now feed data
What if there's no patch?
The checked facts do not describe a workaround or mitigation for this vulnerability.Source: tenable.com