CVE-2021-43257

Name: CVE-2021-43257
Creator: NVD / NIST
Published: 2022-04-14T20:15:09.157+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.8/10EPSS 0.89%

Last modified Jun 17, 2026

CVE-2021-43257 is a high-severity vulnerability rated 7.8/10 on the CVSS scale. Lack of Neutralization of Formula Elements in the CSV API of MantisBT before 2.25.3 allows an unprivileged attacker to execute code or gain access to information when a user opens the csv_export.php generated CSV file in Excel.. EPSS estimates a 0.89% chance of exploitation in the next 30 days.

Description

Lack of Neutralization of Formula Elements in the CSV API of MantisBT before 2.25.3 allows an unprivileged attacker to execute code or gain access to information when a user opens the csv_export.php generated CSV file in Excel.

Metrics

CVSS 3.1

7.8/10

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

EPSS Probability

0.89%

54.8th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-1236

Affected Software

Vendor	Product	Versions
Mantisbt	Mantisbt	< 2.25.3

References

https://github.com/mantisbt/mantisbt/commit/7f4534c723e3162b8784aebda4836324041dbc3ePatch, Third Party Advisory
https://www.mantisbt.org/bugs/view.php?id=29130Exploit, Issue Tracking, Patch, Vendor Advisory
https://github.com/mantisbt/mantisbt/commit/7f4534c723e3162b8784aebda4836324041dbc3ePatch, Third Party Advisory
https://www.mantisbt.org/bugs/view.php?id=29130Exploit, Issue Tracking, Patch, Vendor Advisory

Timeline

Published: Apr 14, 2022
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-43257?

How severe is CVE-2021-43257?

CVE-2021-43257 has a CVSS score of 7.8/10 (HIGH severity). The EPSS model estimates a 0.89% probability of exploitation in the next 30 days.

How do I fix CVE-2021-43257?

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-2021-43257?

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

Scan your code now

Source: NVD / NIST