All vulnerabilities
CVE-2023-33010

Zyxel Multiple Firewalls Buffer Overflow Vulnerability

Zyxel Multiple FirewallsNetwork & edge
Open in ThreatlineRecord JSON
CVSS
9.8Critical
ExploitationExploited in the wildAdded to KEV 5 Jun 2023CISA KEV
Exploit odds (EPSS)29.0%Chance of exploitation activity in the next 30 days, higher than 98% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed inNone listedNo source names a fixed version. Check the vendor advisory below
Federal deadline26 Jun 2023Remediation due date for US federal agenciesCISA KEV
CISA required actionApply updates per vendor instructions. CISA KEV

What fixes it

No source in this snapshot names a fixed version. The vendor advisories under References are the place to check.

Timeline

  1. 24 May 2023, 00:00 UTCPublishedCVE List
  2. 5 Jun 2023Added to CISA KEVCISA KEV

Description

Zyxel ATP, USG FLEX, USG FLEX 50(W), USG20(W)-VPN, VPN, and ZyWALL/USG firewalls contain a buffer overflow vulnerability in the ID processing function that could allow an unauthenticated attacker to cause denial-of-service (DoS) conditions and remote code execution on an affected device.

Text from CVE List

Affected versions 6

  • ATP series firmwareaffected: 4.32 through 5.36 Patch 1CVE List
  • USG FLEX series firmwareaffected: 4.50 through 5.36 Patch 1CVE List
  • USG FLEX 50(W) firmwareaffected: 4.25 through 5.36 Patch 1CVE List
  • USG20(W)-VPN firmwareaffected: 4.25 through 5.36 Patch 1CVE List
  • VPN series firmwareaffected: 4.30 through 5.36 Patch 1CVE List
  • ZyWALL/USG series firmwareaffected: 4.25 through 4.73 Patch 1CVE List

References 3