9.8

CVE-2023-35138: zyxel nas326_firmware OS Command Injection

CVSS: 9.8v3.1CriticalModified
Published 30-11-2023Last modified 02-08-2024
Open JSON

Vulnerability summary

CVE-2023-35138 is a critical (CVSS 9.8) OS Command Injection vulnerability in zyxel nas326_firmware. EPSS estimates a 40.00% chance of exploitation in the next 30 days, higher than 98.6% of scored vulnerabilities.

Overall risk
70/100
0100
High · default modelHow is this calculated?
CVSS score
9.8/10
010
Critical · v3.1 (CVE.org)
EPSS score
40.00%
0%100%
High · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 30-11-2023
    PublishedVulnerability first disclosed.
  2. 02-08-2024
    Last modifiedVulnerability information updated.

Description

A command injection vulnerability in the “show_zysync_server_contents” function of the Zyxel NAS326 firmware version V5.21(AAZF.14)C0 and NAS542 firmware version V5.21(ABAG.11)C0 could allow an unauthenticated attacker to execute some operating system (OS) commands by sending a crafted HTTP POST request.

CVSS metrics

2 scores · 2 sources · 1 version

EPSS trend

Probability

40.00%

Chance of exploitation in the next 30 days

Percentile

99%

Versus all other CVEs

30-day change

0.00 pp

From 40.00% on 20-09-2026

20-09-202620-10-2026
EPSS score
40.00%

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

Zyxel4 products

1 vendor · 4 products

References

1 links