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TI-2024-05886 Aliases CVE-2024-6343GHSA-49fx-5cmv-3mw7

Buffer overflow in Zyxel ATP series firmware

Priority LOW 23CWE-120Published · Updated

Key facts

Attack vector
Network
Privileges required
High
User interaction
None
Attack complexity
Low
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · High
Fix status
No fix listed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-120 and the CVSS impact.

Summary

A buffer overflow vulnerability in the CGI program of Zyxel ATP series firmware versions from V4.32 through V5.38, USG FLEX series firmware versions from V4.50 through V5.38, USG FLEX 50(W) series firmware versions from V4.16 through V5.38, and USG20(W)-VPN series firmware versions from V4.16 through V5.38 could allow an authenticated attacker with administrator privileges to cause denial of service (DoS) conditions by sending a crafted HTTP request to a vulnerable device.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00605 49th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
ZyxelATP series firmwareversions V4.32 through V5.38—No fix listedCNA
ZyxelUSG FLEX series firmwareversions V4.50 through V5.38—No fix listedCNA
ZyxelUSG FLEX 50(W) series firmwareversions V4.16 through V5.38—No fix listedCNA
ZyxelUSG20(W)-VPN series firmwareversions V4.16 through V5.38—No fix listedCNA
  • ATP series firmware VendorZyxel Affected versions V4.32 through V5.38 Fixed in — No fix listed CNA
  • USG FLEX series firmware VendorZyxel Affected versions V4.50 through V5.38 Fixed in — No fix listed CNA
  • USG FLEX 50(W) series firmware VendorZyxel Affected versions V4.16 through V5.38 Fixed in — No fix listed CNA
  • USG20(W)-VPN series firmware VendorZyxel Affected versions V4.16 through V5.38 Fixed in — No fix listed CNA

CPE configurations NVD · 18

CPEVersionsRoleVendor
cpe:2.3:o:zyxel:zld:*:*:*:*:*:*:*:*4.32 to before 5.39VulnerableZyxel
cpe:2.3:h:zyxel:atp100:-:*:*:*:*:*:*:*not specified by NVDRunning onZyxel
cpe:2.3:h:zyxel:atp100w:-:*:*:*:*:*:*:*not specified by NVDRunning onZyxel
cpe:2.3:h:zyxel:atp200:-:*:*:*:*:*:*:*not specified by NVDRunning onZyxel
cpe:2.3:h:zyxel:atp500:-:*:*:*:*:*:*:*not specified by NVDRunning onZyxel
cpe:2.3:h:zyxel:atp700:-:*:*:*:*:*:*:*not specified by NVDRunning onZyxel
cpe:2.3:h:zyxel:atp800:-:*:*:*:*:*:*:*not specified by NVDRunning onZyxel
cpe:2.3:o:zyxel:zld:*:*:*:*:*:*:*:*4.50 to before 5.39VulnerableZyxel
cpe:2.3:h:zyxel:usg_flex_100:-:*:*:*:*:*:*:*not specified by NVDRunning onZyxel
cpe:2.3:h:zyxel:usg_flex_100ax:-:*:*:*:*:*:*:*not specified by NVDRunning onZyxel
  • cpe:2.3:o:zyxel:zld:*:*:*:*:*:*:*:* Versions 4.32 to before 5.39 Vulnerable ·Zyxel
  • cpe:2.3:h:zyxel:atp100:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Zyxel
  • cpe:2.3:h:zyxel:atp100w:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Zyxel
  • cpe:2.3:h:zyxel:atp200:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Zyxel
  • cpe:2.3:h:zyxel:atp500:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Zyxel
  • cpe:2.3:h:zyxel:atp700:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Zyxel
  • cpe:2.3:h:zyxel:atp800:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Zyxel
  • cpe:2.3:o:zyxel:zld:*:*:*:*:*:*:*:* Versions 4.50 to before 5.39 Vulnerable ·Zyxel
  • cpe:2.3:h:zyxel:usg_flex_100:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Zyxel
  • cpe:2.3:h:zyxel:usg_flex_100ax:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Zyxel
Show 8 more CPE
CPEVersionsRoleVendor
cpe:2.3:h:zyxel:usg_flex_100w:-:*:*:*:*:*:*:*not specified by NVDRunning onZyxel
cpe:2.3:h:zyxel:usg_flex_200:-:*:*:*:*:*:*:*not specified by NVDRunning onZyxel
cpe:2.3:h:zyxel:usg_flex_50:-:*:*:*:*:*:*:*not specified by NVDRunning onZyxel
cpe:2.3:h:zyxel:usg_flex_500:-:*:*:*:*:*:*:*not specified by NVDRunning onZyxel
cpe:2.3:h:zyxel:usg_flex_700:-:*:*:*:*:*:*:*not specified by NVDRunning onZyxel
cpe:2.3:o:zyxel:zld:*:*:*:*:*:*:*:*4.16 to before 5.39VulnerableZyxel
cpe:2.3:h:zyxel:usg_flex_50w:-:*:*:*:*:*:*:*not specified by NVDRunning onZyxel
cpe:2.3:h:zyxel:usg_20w-vpn:-:*:*:*:*:*:*:*not specified by NVDRunning onZyxel
  • cpe:2.3:h:zyxel:usg_flex_100w:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Zyxel
  • cpe:2.3:h:zyxel:usg_flex_200:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Zyxel
  • cpe:2.3:h:zyxel:usg_flex_50:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Zyxel
  • cpe:2.3:h:zyxel:usg_flex_500:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Zyxel
  • cpe:2.3:h:zyxel:usg_flex_700:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Zyxel
  • cpe:2.3:o:zyxel:zld:*:*:*:*:*:*:*:* Versions 4.16 to before 5.39 Vulnerable ·Zyxel
  • cpe:2.3:h:zyxel:usg_flex_50w:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Zyxel
  • cpe:2.3:h:zyxel:usg_20w-vpn:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Zyxel

Remediation

No fixed version listed by the sources yet.

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Advisory ·

    Zyxel ATP series firmware, USG FLEX 50(W) series firmware and 2 more products — zyxel.com/global/en/support/security-advisories/zyxel-secur…

    7 records Highest priority Priority MEDIUM 2 MEDIUM, 5 LOW

    Other records, highest priority first

    • TI-2024-28064 NULL pointer dereference in Zyxel ATP series firmwarePriority MEDIUM 40
    • TI-2024-28063 OS command injection in Zyxel ATP series firmwarePriority MEDIUM 40
    • TI-2024-28066 OS command injection in Zyxel ATP series firmwarePriority LOW 36
    Show all 7 records → Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2024-6343
  2. 2026-10-03 Alias added: GHSA-49fx-5cmv-3mw7

References

Advisory 1

  • TI-2024-10813 Path traversal in Zyxel ATP series firmware KEVCVSS 3.1CRITICAL 9.8
  • TI-2020-15281 A stack-based buffer overflow in fbwifi_continue.cgi on Zyxel UTM and VPN series of… CVSS 3.1CRITICAL 9.8
  • TI-2025-08373 Missing authorization in Zyxel ATP series firmware CVSS 3.1HIGH 8.1
  • TI-2023-04062 Integer overflow in Zyxel ATP series firmware CVSS 3.1HIGH 7.5
  • TI-2024-28064 NULL pointer dereference in Zyxel ATP series firmware CVSS 3.1HIGH 7.5
  • TI-2024-28063 OS command injection in Zyxel ATP series firmware CVSS 3.1HIGH 8.1
See all 20 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences