Path traversal in Buffalo WSR-2533DHPL2, Buffalo WSR-2533DHP3
Priority CRITICAL 100Exploited in the wildCWE-22Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA.
Summary
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.
Why it matters now
Exploitation Active In CISA KEV since 2021-11-03CISA due date 2021-11-17
EPSS 0.99982 99th percentileScored 2026-11-07
Public exploit Yes 2 exploit referencesTagged by NVD
Fix No fix listed No fixed version in the sources yet
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Active
- Automatable
- Yes
- Technical impact
- Total
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | Buffalo WSR-2533DHPL2, Buffalo WSR-2533DHP3 | WSR-2533DHPL2 <=1.02, WSR-2533DHP3 <= 1.24 | — | No fix listed | CNA |
- Buffalo WSR-2533DHPL2, Buffalo WSR-2533DHP3 Vendor— Affected WSR-2533DHPL2 <=1.02, WSR-2533DHP3 <= 1.24 Fixed in — No fix listed CNA
CPE configurations NVD · 4
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:buffalo:wsr-2533dhpl2-bk_firmware:*:*:*:*:*:*:*:* | up to 1.02 | Vulnerable | BUFFALO INC. |
| cpe:2.3:h:buffalo:wsr-2533dhpl2-bk:-:*:*:*:*:*:*:* | not specified by NVD | Running on | BUFFALO INC. |
| cpe:2.3:o:buffalo:wsr-2533dhp3-bk_firmware:*:*:*:*:*:*:*:* | up to 1.24 | Vulnerable | BUFFALO INC. |
| cpe:2.3:h:buffalo:wsr-2533dhp3-bk:-:*:*:*:*:*:*:* | not specified by NVD | Running on | BUFFALO INC. |
- cpe:2.3:o:buffalo:wsr-2533dhpl2-bk_firmware:*:*:*:*:*:*:*:* Versions up to 1.02 Vulnerable ·BUFFALO INC.
- cpe:2.3:h:buffalo:wsr-2533dhpl2-bk:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·BUFFALO INC.
- cpe:2.3:o:buffalo:wsr-2533dhp3-bk_firmware:*:*:*:*:*:*:*:* Versions up to 1.24 Vulnerable ·BUFFALO INC.
- cpe:2.3:h:buffalo:wsr-2533dhp3-bk:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·BUFFALO INC.
Remediation
No fixed version listed by the sources yet.
Timeline
- 2021-11-03 Added to CISA KEV
- 2026-10-02 Threatist record created from CVE-2021-20090
- 2026-10-03 Alias added: GHSA-6466-44wr-c6vv
References
More Arcadyan vulnerabilities
- TI-2016-08126 Authorization Bypass in the Web interface of Arcadyan SLT-00 Star* (aka Swisscom… CVSS 3.0HIGH 7.5
- TI-2020-07536 The login password of the web administrative dashboard in Arcadyan Wifi routers… CVSS 3.1MEDIUM 6.5
- TI-2020-07535 Multiple stored cross-site scripting (XSS) vulnerabilities in Arcadyan Wifi routers… CVSS 3.1MEDIUM 5.4
Sources
- CVE-2021-20090 · CVE Program
- CVE-2021-20090 · NVD
- CISA Known Exploited Vulnerabilities
- FIRST EPSS
- GHSA-6466-44wr-c6vv · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences