CVE & CISA-KEV Catalog

CVE-2023-6764

HIGH
8.1
CVSS v3
NVD

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.

CWE-134

How to fix

Remediation Available
atp100 firmwareNVD
Affected:>= 4.32, < 5.37Fixed in:5.37CVE-2023-6764derived from NVD
atp100w firmwareNVD
Affected:>= 4.32, < 5.37Fixed in:5.37CVE-2023-6764derived from NVD
atp200 firmwareNVD
Affected:>= 4.32, < 5.37Fixed in:5.37CVE-2023-6764derived from NVD
atp500 firmwareNVD
Affected:>= 4.32, < 5.37Fixed in:5.37CVE-2023-6764derived from NVD
atp700 firmwareNVD
Affected:>= 4.32, < 5.37Fixed in:5.37CVE-2023-6764derived from NVD
atp800 firmwareNVD
Affected:>= 4.32, < 5.37Fixed in:5.37CVE-2023-6764derived from NVD
usg20-vpn firmwareNVD
Affected:>= 4.16, < 5.37Fixed in:5.37CVE-2023-6764derived from NVD
usg20w-vpn firmwareNVD
Affected:>= 4.16, < 5.37Fixed in:5.37CVE-2023-6764derived from NVD
usg flex 100 firmwareNVD
Affected:>= 4.50, < 5.37Fixed in:5.37CVE-2023-6764derived from NVD
usg flex 100ax firmwareNVD
Affected:>= 4.50, < 5.37Fixed in:5.37CVE-2023-6764derived from NVD
usg flex 100h firmwareNVD
Affected:>= 4.50, < 5.37Fixed in:5.37CVE-2023-6764derived from NVD
usg flex 100w firmwareNVD
Affected:>= 4.50, < 5.37Fixed in:5.37CVE-2023-6764derived from NVD
usg flex 200 firmwareNVD
Affected:>= 4.50, < 5.37Fixed in:5.37CVE-2023-6764derived from NVD
usg flex 200h firmwareNVD
Affected:>= 4.50, < 5.37Fixed in:5.37CVE-2023-6764derived from NVD
usg flex 200hp firmwareNVD
Affected:>= 4.50, < 5.37Fixed in:5.37CVE-2023-6764derived from NVD
usg flex 500 firmwareNVD
Affected:>= 4.50, < 5.37Fixed in:5.37CVE-2023-6764derived from NVD
usg flex 500h firmwareNVD
Affected:>= 4.50, < 5.37Fixed in:5.37CVE-2023-6764derived from NVD
usg flex 50 firmwareNVD
Affected:>= 4.16, < 5.37Fixed in:5.37CVE-2023-6764derived from NVD
usg flex 50w firmwareNVD
Affected:>= 4.16, < 5.37Fixed in:5.37CVE-2023-6764derived from NVD
usg flex 700 firmwareNVD
Affected:>= 4.50, < 5.37Fixed in:5.37CVE-2023-6764derived from NVD
usg flex 700h firmwareNVD
Affected:>= 4.50, < 5.37Fixed in:5.37CVE-2023-6764derived from NVD

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork
Attack ComplexityHigh
Privileges RequiredNone
User InteractionNone
ScopeUnchanged

Impact

ConfidentialityHigh
IntegrityHigh
AvailabilityHigh

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Exploit Intelligence

0.89%probability of exploitation in 30 days
55thpercentile

Moderate risk: more likely to be exploited than 55% of all known CVEs.

References

Vendor Advisory1

Related Vulnerabilities

Other CWE-134 vulnerabilities, ordered by exploit likelihood. View all

CVESeverityCVSSEPSSExploitedFix
CVE-2020-13160Critical9.881%-Fix
CVE-2023-22374High8.573%--
CVE-2012-1851High10.066%--
CVE-2024-23113Critical9.862%KEV-
CVE-2012-3569High9.348%--
CVE-2018-6317Critical9.144%--
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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2025-01-21.