CVE-2023-6764: 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…

PriorityP354high8.1CVSS 3.1

AVNACHPRNUINSUCHIHAH

EPSS

0.89%

55.3th percentile

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.

Affected

46 ranges· showing 25

Vendor	Product	Version range	Fixed in
zyxel	atp100_firmware	—	—
zyxel	atp100_firmware	>= 4.32 < 5.37	5.37
zyxel	atp100w_firmware	—	—
zyxel	atp100w_firmware	>= 4.32 < 5.37	5.37
zyxel	atp200_firmware	—	—
zyxel	atp200_firmware	>= 4.32 < 5.37	5.37
zyxel	atp500_firmware	—	—
zyxel	atp500_firmware	>= 4.32 < 5.37	5.37
zyxel	atp700_firmware	—	—
zyxel	atp700_firmware	>= 4.32 < 5.37	5.37
zyxel	atp800_firmware	—	—
zyxel	atp800_firmware	>= 4.32 < 5.37	5.37
zyxel	atp_series_firmware	—	—
zyxel	usg20-vpn_firmware	—	—
zyxel	usg20-vpn_firmware	>= 4.16 < 5.37	5.37
zyxel	usg20_vpn_series_firmware	—	—
zyxel	usg20w-vpn_firmware	—	—
zyxel	usg20w-vpn_firmware	>= 4.16 < 5.37	5.37
zyxel	usg_flex_100_firmware	—	—
zyxel	usg_flex_100_firmware	>= 4.50 < 5.37	5.37
zyxel	usg_flex_100ax_firmware	—	—
zyxel	usg_flex_100ax_firmware	>= 4.50 < 5.37	5.37
zyxel	usg_flex_100h_firmware	—	—
zyxel	usg_flex_100h_firmware	>= 4.50 < 5.37	5.37
zyxel	usg_flex_100w_firmware	—	—

Stop checking back — get the weekly exploitation signal.

Every Monday: what got weaponized or added to CISA KEV in the last seven days — each CVE cross-linked to its PoC, Nuclei template, and detection rule. Free, one email a week, unsubscribe in one click.