CVE-2022-26531
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…
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (5.67%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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 3.1
- 7.8 HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 5.67% probability · 93th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-20
- Affected
- zyxel/vpn100 firmware · zyxel/vpn1000 firmware · zyxel/vpn300 firmware · zyxel/vpn50 firmware · zyxel/atp100 firmware · zyxel/atp100w firmware · zyxel/atp200 firmware · zyxel/atp500 firmware · zyxel/atp700 firmware · zyxel/atp800 firmware · zyxel/usg 110 firmware · zyxel/usg 1100 firmware · zyxel/usg 1900 firmware · zyxel/usg 20w firmware · zyxel/usg 20w-vpn firmware · zyxel/usg 2200-vpn firmware · zyxel/usg 310 firmware · zyxel/usg 40 firmware · zyxel/usg 40w firmware · zyxel/usg 60 firmware · +40 more
- Source
- security@zyxel.com.tw
References
- http://packetstormsecurity.com/files/167464/Zyxel-Buffer-Overflow-Format-String-Command-Injection.html
- http://packetstormsecurity.com/files/177036/Zyxel-zysh-Format-String-Proof-Of-Concept.html
- http://seclists.org/fulldisclosure/2022/Jun/15
- https://www.zyxel.com/support/multiple-vulnerabilities-of-firewalls-AP-controllers-and-APs.shtmlVendor Advisory
- http://packetstormsecurity.com/files/167464/Zyxel-Buffer-Overflow-Format-String-Command-Injection.html
- http://packetstormsecurity.com/files/177036/Zyxel-zysh-Format-String-Proof-Of-Concept.html
- http://seclists.org/fulldisclosure/2022/Jun/15
- https://www.zyxel.com/support/multiple-vulnerabilities-of-firewalls-AP-controllers-and-APs.shtmlVendor Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.