What is CVE-2021-43257?

CVE-2021-43257 is a high-severity vulnerability in Mantisbt, classified under Improper Neutralization of Formula Elements in a CSV File. CVSS score: 7.8/10. Published 2022-04-14.

How severe is CVE-2021-43257?

High severity. CVSS v3 base score is 7.8 out of 10.

Vulnerability in Mantisbt

CVE-2021-43257

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.

Published 2022-04-14 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.010 (60.7th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 61st percentile — 60.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.009 · newest: 0.010 · change: +0.001

Affected products

Mantisbt

Weakness classification (CWE)

CWE-1236 — Improper Neutralization of Formula Elements in a CSV File

References

www.mantisbt.org/bugs/view.php (Exploit, Patch, Issue Tracking, Vendor Advisory)
github.com/mantisbt/mantisbt/commit/7f4534c723e3162b8784aebda4836324041dbc3e (Patch, Third Party Advisory)

Frequently asked questions

What is CVE-2021-43257?: CVE-2021-43257 is a high-severity vulnerability in Mantisbt, classified under Improper Neutralization of Formula Elements in a CSV File. CVSS score: 7.8/10. Published 2022-04-14.
How severe is CVE-2021-43257?: High severity. CVSS v3 base score is 7.8 out of 10.