AEGLIX vulnerability intelligence
CVE-2023-28771
CRITICAL · CVSS 9.8 · Analyzed
Published: 2023-04-25 · Updated: 2026-06-17 · Source: NVD
Vulnerability overview
Improper error message handling in Zyxel ZyWALL/USG series firmware versions 4.60 through 4.73, VPN series firmware versions 4.60 through 5.35, USG FLEX series firmware versions 4.60 through 5.35, and ATP series firmware versions 4.60 through 5.35, which could allow an unauthenticated attacker to execute some OS commands remotely by sending crafted packets to an affected device.
Severity and scoring
- CVSS score
- 9.8 · CRITICAL
- CVSS version
- 3.1
- CVSS vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Weaknesses
- CWE-78
CVSS measures technical severity; it does not establish whether this vulnerability is being exploited in your environment.
Known exploitation and remediation
Listed in CISA’s Known Exploited Vulnerabilities catalog.
- Affected product
- Zyxel · Multiple Firewalls
- Added to catalog
- 2023-05-31
- Required action
- Apply updates per vendor instructions.
- CISA remediation due date
- 2023-06-21
CISA deadlines apply to the organizations covered by its directives. Confirm your own remediation requirements.
Verify affected versions and patch availability in the vendor advisory before making changes.
Affected products and versions
cpe:2.3:o:zyxel:atp100_firmware:*:*:*:*:*:*:*:*
From (inclusive): 4.60
Before (exclusive): 5.36
cpe:2.3:o:zyxel:atp100w_firmware:*:*:*:*:*:*:*:*
From (inclusive): 4.60
Before (exclusive): 5.35
cpe:2.3:o:zyxel:atp200_firmware:*:*:*:*:*:*:*:*
From (inclusive): 4.60
Before (exclusive): 5.36
cpe:2.3:o:zyxel:atp500_firmware:*:*:*:*:*:*:*:*
From (inclusive): 4.60
Before (exclusive): 5.36
cpe:2.3:o:zyxel:atp700_firmware:*:*:*:*:*:*:*:*
From (inclusive): 4.60
Before (exclusive): 5.36
cpe:2.3:o:zyxel:atp800_firmware:*:*:*:*:*:*:*:*
From (inclusive): 4.60
Before (exclusive): 5.36
cpe:2.3:o:zyxel:usg_flex_100_firmware:*:*:*:*:*:*:*:*
From (inclusive): 4.60
Before (exclusive): 5.36
cpe:2.3:o:zyxel:usg_flex_100w_firmware:*:*:*:*:*:*:*:*
From (inclusive): 4.60
Before (exclusive): 5.36
cpe:2.3:o:zyxel:usg_flex_200_firmware:*:*:*:*:*:*:*:*
From (inclusive): 4.60
Before (exclusive): 5.36
cpe:2.3:o:zyxel:usg_flex_50_firmware:*:*:*:*:*:*:*:*
From (inclusive): 4.60
Before (exclusive): 5.36
cpe:2.3:o:zyxel:usg_flex_500_firmware:*:*:*:*:*:*:*:*
From (inclusive): 4.60
Before (exclusive): 5.36
cpe:2.3:o:zyxel:usg_flex_50w_firmware:*:*:*:*:*:*:*:*
From (inclusive): 4.60
Before (exclusive): 5.36
cpe:2.3:o:zyxel:usg_flex_700_firmware:*:*:*:*:*:*:*:*
From (inclusive): 4.60
Before (exclusive): 5.36
cpe:2.3:o:zyxel:vpn100_firmware:*:*:*:*:*:*:*:*
From (inclusive): 4.60
Before (exclusive): 5.36
cpe:2.3:o:zyxel:vpn1000_firmware:*:*:*:*:*:*:*:*
From (inclusive): 4.60
Before (exclusive): 5.36
cpe:2.3:o:zyxel:vpn300_firmware:*:*:*:*:*:*:*:*
From (inclusive): 4.60
Before (exclusive): 5.36
cpe:2.3:o:zyxel:vpn50_firmware:*:*:*:*:*:*:*:*
From (inclusive): 4.60
Before (exclusive): 5.36
cpe:2.3:o:zyxel:zywall_usg_310_firmware:*:*:*:*:*:*:*:*
From (inclusive): 4.60
Before (exclusive): 4.73
cpe:2.3:o:zyxel:zywall_usg_310_firmware:4.73:-:*:*:*:*:*:*
cpe:2.3:o:zyxel:zywall_usg_100_firmware:*:*:*:*:*:*:*:*
From (inclusive): 4.60
Before (exclusive): 4.73
cpe:2.3:o:zyxel:zywall_usg_100_firmware:4.73:-:*:*:*:*:*:*
These are NVD CPE applicability entries. Some products depend on configuration conditions; consult the official record to confirm applicability.
Advisories and references
- http://packetstormsecurity.com/files/172820/Zyxel-IKE-Packet-Decoder-Unauthenticated-Remote-Code-Execution.html
Exploit · Third Party Advisory
- https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-remote-command-injection-vulnerability-of-firewalls
Vendor Advisory
- http://packetstormsecurity.com/files/172820/Zyxel-IKE-Packet-Decoder-Unauthenticated-Remote-Code-Execution.html
Exploit · Third Party Advisory
- https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-remote-command-injection-vulnerability-of-firewalls
Vendor Advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-28771
US Government Resource