CVE-2023-28771 kev in the critical feed json
Improper error message handling in Zyxel ZyWALL/USG series firmware versions 4.60 through 4.73, VPN series firmware versions 4.60 through 5…
published 2023-04-25 3 y ago modified 2026-06-17 4 mo ago also EUVD-2023-32406
- cvss
- 9.8
- version 3.1, CNA
- cisa kev
- Exploited
- added 2023-05-31
- epss
- 99.3%
- EPSS 99.3% chance of exploitation in 30 days, percentile 99.9%
- public exploits
- 1
- Metasploit
Summary
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.
Patch / fix
cisa required action Apply updates per vendor instructions.
- zyxel atp100_firmware 5.36
- zyxel atp100w_firmware 5.35
- zyxel atp200_firmware 5.36
- zyxel atp500_firmware 5.36
- zyxel atp700_firmware 5.36
- zyxel atp800_firmware 5.36
- zyxel usg_flex_100_firmware 5.36
- zyxel usg_flex_100w_firmware 5.36
- zyxel usg_flex_200_firmware 5.36
- zyxel usg_flex_50_firmware 5.36
- zyxel usg_flex_500_firmware 5.36
- zyxel usg_flex_50w_firmware 5.36
- zyxel usg_flex_700_firmware 5.36
- zyxel vpn100_firmware 5.36
- zyxel vpn1000_firmware 5.36
- zyxel vpn300_firmware 5.36
- zyxel vpn50_firmware 5.36
- zyxel zywall_usg_310_firmware 4.73
- zyxel zywall_usg_100_firmware 4.73
Timeline
- First public exploit (Metasploit exploit/linux/misc/zyxel_ike_decoder_rce_cve_2023_28771)
- Published
- Added to CISA KEV
- CISA patch deadline
- CISA SSVC: exploitation active
Known exploited
- Added
- 3 y ago
- Patch by
- 2023-06-21 (3 y ago)
- Ransomware
- Not known
- Required action
- Apply updates per vendor instructions.
- Vendor, product
- Zyxel, Multiple Firewalls
- CISA name
- Zyxel Multiple Firewalls OS Command Injection Vulnerability
CISA SSVC
- Exploitation
- Active, exploited in the wild
- Automatable
- yes
- Technical impact
- total
- Assessed
- 2 y ago
Exploit prediction
99.28% chance of exploitation in the next 30 days, higher than 99.9% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- Metasploit exploit/linux/misc/zyxel_ike_decoder_rce_cve_2023_28771 Zyxel IKE Packet Decoder Unauthenticated Remote Code Execution metasploit exploit, great rank, 2023-03-31
- packetstormsecurity.com http://packetstormsecurity.com/files/172820/Zyxel-IKE-Packet-Decoder-Unauthenticated-Remote-Code-Execution.html referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
Affected products
- Zyxel ZyWALL/USG series firmware
- Zyxel VPN series firmware
- Zyxel USG FLEX series firmware
- Zyxel ATP series firmware
Classification
- Weakness
-
- CWE-78 Improper Neutralization of Special Elements used in an OS Command
References
-
packetstormsecurity.com
/files/172820/Zyxel-IKE-Packet-Decoder-Unauthenticated-Remote-Code-Execution.html
exploit, third-party-advisory
-
zyxel.com
/global/en/support/security-advisories/zyxel-security-advisory-for-remote-command-injection-vulnerability-of-f
vendor-advisory
-
cisa.gov
/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-28771
government-resource, us-government-resource
Sources
- CVE List CVE-2023-28771
- NVD CVE-2023-28771
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.