CVE-2020-25014

CRITICALNVD 9.89.8—

9.8

A stack-based buffer overflow in fbwifi_continue.cgi on Zyxel UTM and VPN series of gateways running firmware version V4.30 through to V4.55 allows remote unauthenticated attackers to execute arbitrary code via a crafted http packet.

CVSS v3: 9.8
EG Score: 9.8(medium)
EPSS: 84.0%
KEV: Not listed

Published

November 27, 2020

Last Modified

December 12, 2024

References (4)

cve@mitrehttps://businessforum.zyxel.com/categories/security-news-and-release
cve@mitrehttps://www.zyxel.com/support/Zyxel-security-advisory-for-buffer-overflow-vulnerability.shtml
af854a3a-2127-422b-91ae-364da2661108https://businessforum.zyxel.com/categories/security-news-and-release
af854a3a-2127-422b-91ae-364da2661108https://www.zyxel.com/support/Zyxel-security-advisory-for-buffer-overflow-vulnerability.shtml

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

CWE-787Out-of-bounds Write

Data Freshness Timeline

(refreshed 12× in last 7d / 20× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

2026-06-08 14:15 UTCEPSS rescore
2026-06-08 14:15 UTCEPSS rescore
2026-06-07 15:23 UTCEPSS rescore
2026-06-07 15:23 UTCEPSS rescore
2026-06-06 13:45 UTCEPSS rescore
2026-06-06 13:45 UTCEPSS rescore
2026-06-05 22:45 UTCEPSS rescore
2026-06-05 22:45 UTCEPSS rescore
2026-06-05 06:08 UTCEPSS rescore
2026-06-05 06:08 UTCEPSS rescore
2026-06-04 13:10 UTCEPSS rescore
2026-06-04 13:10 UTCEPSS rescore
2026-06-02 20:11 UTCEPSS rescore
2026-06-02 20:11 UTCEPSS rescore
2026-06-01 13:50 UTCEPSS rescore
2026-06-01 13:50 UTCEPSS rescore
2026-05-31 22:29 UTCEPSS rescore
2026-05-31 22:29 UTCEPSS rescore
2026-05-31 00:15 UTCEPSS rescore
2026-05-31 00:15 UTCEPSS rescore

Frequently asked(5)

What is CVE-2020-25014?

CVE-2020-25014 is a critical vulnerability published on November 27, 2020. A stack-based buffer overflow in fbwifi_continue.cgi on Zyxel UTM and VPN series of gateways running firmware version V4.30 through to V4.55 allows remote unauthenticated attackers to execute arbitrary code via a crafted http packet.

When was CVE-2020-25014 disclosed?

CVE-2020-25014 was first published in the National Vulnerability Database on November 27, 2020, with the most recent update on December 12, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2020-25014 actively exploited?

CVE-2020-25014 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 84.0% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2020-25014?

CVE-2020-25014 has a CVSS v3 base score of 9.8 (NVD).

How do I remediate CVE-2020-25014?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2020-25014, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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CVE-2020-25014

📅 Published

🔄 Last Modified

🔗 References (4)

Weakness Classification(1)

Data Freshness Timeline

❓ Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2020-25014?

🔗 Related CVEs(same CWE)

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Published

Last Modified

References (4)

Frequently asked(5)

Related CVEs(same CWE)