High severity · published May 24, 2022
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…
7.8
CVSS
6.2%
EPSS
No
On KEV
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 vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack vector
Local
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)6.2% · higher than 93% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
AF
Atp100 Firmware · Zyxel
4.32 through 5.21 · source: NVD
AF
Atp100w Firmware · Zyxel
4.32 through 5.21 · source: NVD
AF
Atp200 Firmware · Zyxel
4.32 through 5.21 · source: NVD
AF
Atp500 Firmware · Zyxel
4.32 through 5.21 · source: NVD
AF
Atp700 Firmware · Zyxel
4.32 through 5.21 · source: NVD
AF
Atp800 Firmware · Zyxel
4.32 through 5.21 · source: NVD
NF
Nap203 Firmware · Zyxel
through 6.25\(abfa.7\) · source: NVD
NF
Nap303 Firmware · Zyxel
through 6.25\(abex.7\) · source: NVD
NF
Nap353 Firmware · Zyxel
through 6.25\(abey.7\) · source: NVD
NF
Nsg100 Firmware · Zyxel
1.00 before 1.33; 1.33; 1.33; 1.33; 1.33; 1.33 · source: NVD
NF
Nsg300 Firmware · Zyxel
1.00 before 1.33; 1.33; 1.33; 1.33; 1.33; 1.33 · source: NVD
NF
Nsg50 Firmware · Zyxel
1.00 before 1.33; 1.33; 1.33; 1.33; 1.33; 1.33 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2022-26531
CVE.org
https://www.cve.org/CVERecord?id=CVE-2022-26531
packetstormsecurity.com
http://packetstormsecurity.com/files/167464/Zyxel-Buffer-Overflow-Format-String-Command-Injection.html
packetstormsecurity.com
http://packetstormsecurity.com/files/177036/Zyxel-zysh-Format-String-Proof-Of-Concept.html
seclists.org
http://seclists.org/fulldisclosure/2022/Jun/15
Vendor Advisory
https://www.zyxel.com/support/multiple-vulnerabilities-of-firewalls-AP-controllers-and-APs.shtml
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