Vulnerability Description
Multiple improper input validation flaws were identified in some CLI commands of Zyxel USG/ZyWALL series firmware versions 4.09 through 4.71, USG FLEX series firmware versions 4.50 through 5.21, ATP series firmware versions 4.32 through 5.21, VPN series firmware versions 4.30 through 5.21, NSG series firmware versions 1.00 through 1.33 Patch 4, NXC2500 firmware version 6.10(AAIG.3) and earlier versions, NAP203 firmware version 6.25(ABFA.7) and earlier versions, NWA50AX firmware version 6.25(ABYW.5) and earlier versions, WAC500 firmware version 6.30(ABVS.2) and earlier versions, and WAX510D firmware version 6.30(ABTF.2) and earlier versions, that could allow a local authenticated attacker to cause a buffer overflow or a system crash via a crafted payload.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Zyxel | Vpn100 Firmware | >= 4.30, <= 5.21 |
| Zyxel | Vpn100 | - |
| Zyxel | Vpn1000 Firmware | >= 4.30, <= 5.21 |
| Zyxel | Vpn1000 | - |
| Zyxel | Vpn300 Firmware | >= 4.30, <= 5.21 |
| Zyxel | Vpn300 | - |
| Zyxel | Vpn50 Firmware | >= 4.30, <= 5.21 |
| Zyxel | Vpn50 | - |
| Zyxel | Atp100 Firmware | >= 4.32, <= 5.21 |
| Zyxel | Atp100 | - |
| Zyxel | Atp100W Firmware | >= 4.32, <= 5.21 |
| Zyxel | Atp100W | - |
| Zyxel | Atp200 Firmware | >= 4.32, <= 5.21 |
| Zyxel | Atp200 | - |
| Zyxel | Atp500 Firmware | >= 4.32, <= 5.21 |
| Zyxel | Atp500 | - |
| Zyxel | Atp700 Firmware | >= 4.32, <= 5.21 |
| Zyxel | Atp700 | - |
| Zyxel | Atp800 Firmware | >= 4.32, <= 5.21 |
| Zyxel | Atp800 | - |
Related Weaknesses (CWE)
References
- http://packetstormsecurity.com/files/167464/Zyxel-Buffer-Overflow-Format-String-
- http://packetstormsecurity.com/files/177036/Zyxel-zysh-Format-String-Proof-Of-Co
- http://seclists.org/fulldisclosure/2022/Jun/15
- https://www.zyxel.com/support/multiple-vulnerabilities-of-firewalls-AP-controlleVendor Advisory
- http://packetstormsecurity.com/files/167464/Zyxel-Buffer-Overflow-Format-String-
- http://packetstormsecurity.com/files/177036/Zyxel-zysh-Format-String-Proof-Of-Co
- http://seclists.org/fulldisclosure/2022/Jun/15
- https://www.zyxel.com/support/multiple-vulnerabilities-of-firewalls-AP-controlleVendor Advisory
FAQ
What is CVE-2022-26531?
CVE-2022-26531 is a vulnerability with a CVSS score of 6.1 (MEDIUM). Multiple improper input validation flaws were identified in some CLI commands of Zyxel USG/ZyWALL series firmware versions 4.09 through 4.71, USG FLEX series firmware versions 4.50 through 5.21, ATP s...
How severe is CVE-2022-26531?
CVE-2022-26531 has been rated MEDIUM with a CVSS base score of 6.1/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2022-26531?
Check the references section above for vendor advisories and patch information. Affected products include: Zyxel Vpn100 Firmware, Zyxel Vpn100, Zyxel Vpn1000 Firmware, Zyxel Vpn1000, Zyxel Vpn300 Firmware.