CVE-2021-35299

Name: CVE-2021-35299
Creator: NVD / NIST
Published: 2021-06-28T20:15:07.977+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 1.12%

Last modified Jun 17, 2026

CVE-2021-35299 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. Incorrect Access Control in Zammad 1.0.x up to 4.0.0 allows attackers to obtain sensitive information via email connection configuration probing.. EPSS estimates a 1.12% chance of exploitation in the next 30 days.

Description

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

Metrics

CVSS 3.1

7.5/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

EPSS Probability

1.12%

62.0th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-532

Affected Software

Vendor	Product	Versions
Zammad	Zammad	>= 1.0.0, <= 4.0.0

References

https://zammad.com/en/advisories/zaa-2021-02Vendor Advisory
https://zammad.com/en/advisories/zaa-2021-02Vendor Advisory

Timeline

Published: Jun 28, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is 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.

How severe is CVE-2021-35299?

CVE-2021-35299 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 1.12% probability of exploitation in the next 30 days.

How do I fix CVE-2021-35299?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-35299?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST