CVE-2023-6764: zyxel atp series firmware
Vulnerability summary
CVE-2023-6764 is a high (CVSS 8.1) vulnerability in zyxel atp series firmware. EPSS estimates a 0.89% chance of exploitation in the next 30 days, higher than 58.6% of scored vulnerabilities.
Timeline
- 20-02-2024PublishedVulnerability first disclosed.
- 02-08-2024Last modifiedVulnerability information updated.
Description
A format string vulnerability in a function of the IPSec VPN feature in Zyxel ATP series firmware versions from 4.32 through 5.37 Patch 1, USG FLEX series firmware versions from 4.50 through 5.37 Patch 1, USG FLEX 50(W) series firmware versions from 4.16 through 5.37 Patch 1, and USG20(W)-VPN series firmware versions from 4.16 through 5.37 Patch 1 could allow an attacker to achieve unauthorized remote code execution by sending a sequence of specially crafted payloads containing an invalid pointer; however, such an attack would require detailed knowledge of an affected device’s memory layout and configuration.
CVSS metrics
2 scores · 2 sources · 1 version- NVDNIST8.1HighCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS trend
Probability
0.89%
Chance of exploitation in the next 30 days
Percentile
59%
Versus all other CVEs
30-day change
0.00 pp
From 0.89% on 19-09-2026
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Zyxel25 products
- atp series firmwareversion 4.32 through 5.37 Patch 1
- atp100_firmware≥ 4.32, < 5.37 | 5.37 | 5.37:patch1
- atp100w_firmware≥ 4.32, < 5.37 | 5.37 | 5.37:patch1
- atp200_firmware≥ 4.32, < 5.37 | 5.37 | 5.37:patch1
- atp500_firmware≥ 4.32, < 5.37 | 5.37 | 5.37:patch1
1 vendor · 25 products
References
1 links- www.zyxel.com/global/…Vendor Advisory