What is CVE-2021-35299?

CVE-2021-35299 is a high-severity vulnerability in Zammad, classified under Insertion of Sensitive Information into Log File. CVSS score: 7.5/10. Published 2021-06-28.

How severe is CVE-2021-35299?

High severity. CVSS v3 base score is 7.5 out of 10.

Information disclosure in Zammad

CVE-2021-35299

Incorrect Access Control in Zammad 1.0.x up to 4.0.0 allows attackers to obtain sensitive information via email connection configuration probing.

Published 2021-06-28 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.011 (64.8th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 65th percentile — 64.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.011 · newest: 0.011 · change: 0.000

Affected products

Zammad

Weakness classification (CWE)

CWE-532 — Insertion of Sensitive Information into Log File

References

zammad.com/en/advisories/zaa-2021-02 (Vendor Advisory)

Frequently asked questions

What is CVE-2021-35299?: CVE-2021-35299 is a high-severity vulnerability in Zammad, classified under Insertion of Sensitive Information into Log File. CVSS score: 7.5/10. Published 2021-06-28.
How severe is CVE-2021-35299?: High severity. CVSS v3 base score is 7.5 out of 10.