CVE-2024-42057: A command injection vulnerability in the IPSec VPN feature of Zyxel ATP series firmware versions from V4.32 through V…
- Is it exploited?
Reported, not confirmed by CISA. VulnCheck KEV lists it as exploited in the wild. CISA has not added it to its Known Exploited Vulnerabilities catalog as of .
VulnCheck KEV lists it since . It cites 3 public reports, the first from .
- How likely is exploitation in the next 30 days?
- 1.3%
EPSS score, percentile 70.8 of all scored records. A probability estimated by FIRST, not a report of exploitation.
- How severe?
- 8.1 High
CVSS v3.1 base score, given by the CNA
- What should I do?
CISA has set no required action, because the vulnerability is not in KEV.
- Which versions are affected?
Affected
- versions V4.32 through V5.38
- versions V4.50 through V5.38
- versions V4.16 through V5.38
- versions V4.16 through V5.38
Source: CISA KEV 2026.10.29, as of ; VulnCheck KEV, as of ; FIRST EPSS, as of ; CVE List, as of . About the data.
Description
A command injection vulnerability in the IPSec VPN feature 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 unauthenticated attacker to execute some OS commands on an affected device by sending a crafted username to the vulnerable device. Note that this attack could be successful only if the device was configured in User-Based-PSK authentication mode and a valid user with a long username exceeding 28 characters exists.
Source: CVE List, as of . About the data.
What to do
Advisories and patches
This summary is based on the CVE record as of . Check the vendor's advisory before you act: affected versions and fixes can change.
Affected products and versions
Versions by product, as listed in the CVE record (4 products)
| Status | Versions |
|---|---|
| Affected | versions V4.32 through V5.38 |
Versions not listed are: unaffected.
| Status | Versions |
|---|---|
| Affected | versions V4.50 through V5.38 |
Versions not listed are: unaffected.
| Status | Versions |
|---|---|
| Affected | versions V4.16 through V5.38 |
Versions not listed are: unaffected.
| Status | Versions |
|---|---|
| Affected | versions V4.16 through V5.38 |
Versions not listed are: unaffected.
Source: CVE List, as of . About the data.
Weakness
CWE-78
- CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
CWE and CAPEC are maintained by MITRE; the entries are those named in the CVE record.
Timeline
| Date | Event |
|---|---|
| CVE record published |
Known exploited Zyxel vulnerabilities
- CVE-2026-7273: Zyxel GS1900 Series Switches Stack-Based Buffer Overflow Vulnerability
- CVE-2024-40890: Zyxel DSL CPE OS Command Injection Vulnerability
- CVE-2024-40891: Zyxel DSL CPE OS Command Injection Vulnerability
- CVE-2024-11667: Zyxel Multiple Firewalls Path Traversal Vulnerability
- CVE-2017-6884: Zyxel EMG2926 Routers Command Injection Vulnerability