CVE-2021-43257

HIGHNVD 7.87.8—

7.8

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.

CVSS v3: 7.8
EG Score: 7.8(medium)
EPSS: 72.8%
KEV: Not listed

Published

April 14, 2022

Last Modified

November 21, 2024

References (4)

cve@mitrehttps://github.com/mantisbt/mantisbt/commit/7f4534c723e3162b8784aebda4836324041dbc3e
cve@mitrehttps://www.mantisbt.org/bugs/view.php?id=29130
af854a3a-2127-422b-91ae-364da2661108https://github.com/mantisbt/mantisbt/commit/7f4534c723e3162b8784aebda4836324041dbc3e
af854a3a-2127-422b-91ae-364da2661108https://www.mantisbt.org/bugs/view.php?id=29130

Affected Packages

(1 across 1 ecosystem)

Packagist(1)

Package	Vulnerable range	Fixed in	Dependents
mantisbt/mantisbt	2.10.0 ... 2.9.1 (59 versions)	2.25.3	—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

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

Data Freshness Timeline

(refreshed 8× in last 7d / 8× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-05-27 13:39 UTCepss_batch
2026-05-27 13:39 UTCepss_batch
2026-05-26 13:42 UTCepss_batch
2026-05-26 13:42 UTCepss_batch
2026-05-26 07:17 UTCepss_batch
2026-05-26 07:17 UTCepss_batch
2026-05-26 07:17 UTCepss_batch
2026-05-25 23:49 UTCEG score recompute

Frequently asked(5)

What is CVE-2021-43257?

CVE-2021-43257 is a high vulnerability published on April 14, 2022. 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.

When was CVE-2021-43257 disclosed?

CVE-2021-43257 was first published in the National Vulnerability Database on April 14, 2022, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2021-43257 actively exploited?

CVE-2021-43257 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 72.8% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2021-43257?

CVE-2021-43257 has a CVSS v3 base score of 7.8 (NVD).

How do I remediate CVE-2021-43257?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-43257, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2021-43257

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