CVE-2023-22916: zyxel atp series firmware Improper Input Validation
Vulnerability summary
CVE-2023-22916 is a high (CVSS 8.1) Improper Input Validation vulnerability in zyxel atp series firmware. EPSS estimates a 0.69% chance of exploitation in the next 30 days, higher than 52% of scored vulnerabilities.
Timeline
- 24-04-2023PublishedVulnerability first disclosed.
- 12-02-2025Last modifiedVulnerability information updated.
Description
The configuration parser of Zyxel ATP series firmware versions 5.10 through 5.35, USG FLEX series firmware versions 5.00 through 5.35, USG FLEX 50(W) firmware versions 5.10 through 5.35, USG20(W)-VPN firmware versions 5.10 through 5.35, and VPN series firmware versions 5.00 through 5.35, which fails to properly sanitize user input. A remote unauthenticated attacker could leverage the vulnerability to modify device configuration data, resulting in DoS conditions on an affected device if the attacker could trick an authorized administrator to switch the management mode to the cloud mode.
CVSS metrics
2 scores · 2 sources · 1 version- NVDNIST8.1HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:H
EPSS trend
Probability
0.69%
Chance of exploitation in the next 30 days
Percentile
52%
Versus all other CVEs
30-day change
0.00 pp
From 0.69% on 20-09-2026
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Zyxel23 products
- atp series firmware5.10 through 5.35
- atp100_firmware≥ 5.10, ≤ 5.35
- atp100w_firmware≥ 5.10, ≤ 5.35
- atp200_firmware≥ 5.10, ≤ 5.35
- atp500_firmware≥ 5.10, ≤ 5.35
1 vendor · 23 products
References
1 links- www.zyxel.com/global/…Vendor Advisory