CVE-2021-35300

Name: CVE-2021-35300
Creator: NVD / NIST
Published: 2021-06-28T20:15:08.06+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 4.3/10EPSS 0.89%

Last modified Jun 17, 2026

CVE-2021-35300 is a medium-severity vulnerability rated 4.3/10 on the CVSS scale. Text injection/Content Spoofing in 404 page in Zammad 1.0.x up to 4.0.0 could allow remote attackers to manipulate users into visiting the attackers' page.. EPSS estimates a 0.89% chance of exploitation in the next 30 days.

Description

Text injection/Content Spoofing in 404 page in Zammad 1.0.x up to 4.0.0 could allow remote attackers to manipulate users into visiting the attackers' page.

Metrics

CVSS 3.1

4.3/10

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

EPSS Probability

0.89%

54.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-1021

Affected Software

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

References

https://zammad.com/en/advisories/zaa-2021-07Patch, Vendor Advisory
https://zammad.com/en/advisories/zaa-2021-07Patch, Vendor Advisory

Timeline

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

Frequently Asked Questions

What is CVE-2021-35300?

Text injection/Content Spoofing in 404 page in Zammad 1.0.x up to 4.0.0 could allow remote attackers to manipulate users into visiting the attackers' page.

How severe is CVE-2021-35300?

CVE-2021-35300 has a CVSS score of 4.3/10 (MEDIUM severity). The EPSS model estimates a 0.89% probability of exploitation in the next 30 days.

How do I fix CVE-2021-35300?

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-2021-35300?

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

Scan your code now

Source: NVD / NIST