9.8

CVE-2020-25014: zyxel access_points_firmware Out-of-bounds Write

CVSS: 9.8v3.1CriticalModified
Published 27-11-2020Last modified 04-08-2024
Open JSON

Vulnerability summary

CVE-2020-25014 is a critical (CVSS 9.8) Out-of-bounds Write vulnerability in zyxel access_points_firmware. EPSS estimates a 4.44% chance of exploitation in the next 30 days, higher than 91.3% of scored vulnerabilities.

Overall risk
70/100
0100
High · default modelHow is this calculated?
CVSS score
9.8/10
010
Critical · v3.1 (NVD)
EPSS score
4.44%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 27-11-2020
    PublishedVulnerability first disclosed.
  2. 04-08-2024
    Last modifiedVulnerability information updated.

Description

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 metrics

2 scores · 1 source · 2 versions

EPSS trend

Probability

4.44%

Chance of exploitation in the next 30 days

Percentile

91%

Versus all other CVEs

30-day change

0.00 pp

From 4.44% on 20-09-2026

20-09-202620-10-2026
EPSS score
4.44%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Zyxel2 products
  • access_points_firmware≤ 6.10 | 6.10 | 6.10:patch1 | 6.10:patch2 | 6.10:patch3 | 6.10:patch4 | 6.10:patch5 | 6.10:patch6 | 6.10:patch7 | na
  • zld≥ 4.30, ≤ 4.55

1 vendor · 2 products

References

2 links