CVE-2020-29299
CVE-2020-29299 is a high-severity vulnerability in Zyxel Vpn Orchestrator with a CVSS 3.x base score of 7.2. 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-77.
Key facts
- Severity: High (CVSS 3.x base score 7.2)
- CVSS v2: 9.0
- EPSS exploit prediction: 2% (82nd percentile)
- Actively exploited: Not listed in CISA KEV
- Weakness: CWE-77
- Affected product: Zyxel Vpn Orchestrator
- Published:
- Last modified:
Description
Certain Zyxel products allow command injection by an admin via an input string to chg_exp_pwd during a password-change action. This affects VPN On-premise before ZLD V4.39 week38, VPN Orchestrator before SD-OS V10.03 week32, USG before ZLD V4.39 week38, USG FLEX before ZLD V4.55 week38, ATP before ZLD V4.55 week38, and NSG before 1.33 patch 4.
Frequently asked questions
- What is CVE-2020-29299?
- Certain Zyxel products allow command injection by an admin via an input string to chg_exp_pwd during a password-change action. This affects VPN On-premise before ZLD V4.39 week38, VPN Orchestrator before SD-OS V10.03 week32, USG before ZLD V4.39 week38, USG FLEX before ZLD V4.55 week38, ATP before ZLD V4.55 week38, and NSG before 1.33 patch 4.
- How severe is CVE-2020-29299?
- CVE-2020-29299 has a CVSS 3.x base score of 7.2, rated high severity. It is exploitable over network with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
- Is CVE-2020-29299 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (82nd percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2020-29299?
- CVE-2020-29299 primarily affects Zyxel Vpn Orchestrator. In total, 6 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
- How do I fix CVE-2020-29299?
- 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.
- When was CVE-2020-29299 published?
- CVE-2020-29299 was published on 2020-12-27 and last updated on 2026-06-17.
References
- https://www.zyxel.com/support/Zyxel-security-advisory-for-command-injection-vulnerability-of-firewalls.shtml
- https://www.zyxel.com/us/en/support/security_advisories.shtml
Affected products (6)
- cpe:2.3:o:zyxel:vpn_orchestrator:*:*:*:*:*:*:*:*
- cpe:2.3:o:zyxel:zld:*:*:*:*:*:*:*:*
- cpe:2.3:o:zyxel:nsg_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:o:zyxel:nsg_firmware:1.33:-:*:*:*:*:*:*
- cpe:2.3:o:zyxel:nsg_firmware:1.33:patch1:*:*:*:*:*:*
- cpe:2.3:o:zyxel:usg_flex_firmware:-:*:*:*:*:*:*:*
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