CVE-2024-42057
CVE-2024-42057 is a high-severity vulnerability in Zyxel Zld with a CVSS 3.x base score of 8.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-78.
Key facts
- Severity: High (CVSS 3.x base score 8.1)
- EPSS exploit prediction: 1% (69th percentile)
- Actively exploited: Not listed in CISA KEV
- EU (EUVD) id: EUVD-2024-39425
- Weakness: CWE-78
- Affected product: Zyxel Zld
- Published:
- Last modified:
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.
Frequently asked questions
- What is CVE-2024-42057?
- 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.
- How severe is CVE-2024-42057?
- CVE-2024-42057 has a CVSS 3.x base score of 8.1, rated high severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
- Is CVE-2024-42057 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (69th percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2024-42057?
- CVE-2024-42057 affects Zyxel Zld. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2024-42057?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
- Does CVE-2024-42057 have an EU (EUVD) identifier?
- Yes. CVE-2024-42057 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2024-39425.
- When was CVE-2024-42057 published?
- CVE-2024-42057 was published on 2024-09-03 and last updated on 2026-06-17.
References
Affected products (1)
- cpe:2.3:o:zyxel:zld:*:*:*:*:*:*:*:*
More vulnerabilities in Zyxel Zld
- CVE-2020-25014 — Critical (CVSS 9.8): A stack-based buffer overflow in fbwifi_continue.cgi on Zyxel UTM and VPN series of gateways running firmware version…
- CVE-2025-9133 — High (CVSS 8.1): A missing authorization vulnerability in Zyxel ATP series firmware versions from V4.32 through V5.40, USG FLEX series…
- CVE-2024-11667 — High (CVSS 7.5): A directory traversal vulnerability in the web management interface of Zyxel ATP series firmware versions V5.00 through…
- CVE-2024-42058 — High (CVSS 7.5): A null pointer dereference vulnerability in Zyxel ATP series firmware versions from V4.32 through V5.38, USG FLEX…
- CVE-2023-4398 — High (CVSS 7.5): An integer overflow vulnerability in the source code of the QuickSec IPSec toolkit used in the VPN feature of the Zyxel…
- CVE-2025-8078 — High (CVSS 7.2): A post-authentication command injection vulnerability in Zyxel ATP series firmware versions from V4.32 through V5.40,…
All CVEs affecting Zyxel Zld →
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