How severe is CVE-2021-47901?

CVE-2021-47901 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-47901 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (30th percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2021-47901?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

Does CVE-2021-47901 have an EU (EUVD) identifier?

Yes. CVE-2021-47901 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2021-34747.

When was CVE-2021-47901 published?

CVE-2021-47901 was published on 2026-01-27 and last updated on 2026-06-17.

CVE-2021-47901

CVE-2021-47901 is a critical-severity vulnerability with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-1236.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v4: 5.1
EPSS exploit prediction: 0% (30th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2021-34747
Weakness: CWE-1236
Published: 2026-01-27
Last modified: 2026-06-17

Description

Dirsearch 0.4.1 contains a CSV injection vulnerability when using the --csv-report flag that allows attackers to inject formulas through redirected endpoints. Attackers can craft malicious server redirects with comma-separated paths containing Excel formulas to manipulate the generated CSV report.

Frequently asked questions

What is CVE-2021-47901?: Dirsearch 0.4.1 contains a CSV injection vulnerability when using the --csv-report flag that allows attackers to inject formulas through redirected endpoints. Attackers can craft malicious server redirects with comma-separated paths containing Excel formulas to manipulate the generated CSV report.
How severe is CVE-2021-47901?: CVE-2021-47901 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-47901 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (30th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2021-47901?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
Does CVE-2021-47901 have an EU (EUVD) identifier?: Yes. CVE-2021-47901 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2021-34747.
When was CVE-2021-47901 published?: CVE-2021-47901 was published on 2026-01-27 and last updated on 2026-06-17.

References

Other CWE-1236 (Improper Neutralization of Formula Elements in a CSV File) vulnerabilities

CVE-2026-31049 — Critical (CVSS 9.8): An issue in Hostbill v.2025-11-24 and 2025-12-01 allows a remote attacker to execute arbitrary code and escalate…
CVE-2020-36962 — Critical (CVSS 9.8): Tendenci 12.3.1 contains a CSV formula injection vulnerability in the contact form message field that allows attackers…
CVE-2020-36941 — Critical (CVSS 9.8): Knockpy 4.1.1 contains a CSV injection vulnerability that allows attackers to inject malicious formulas into CSV…
CVE-2025-56267 — Critical (CVSS 9.8): A CSV injection vulnerability in the /id_profiles endpoint of Avigilon ACM v7.10.0.20 allows attackers to execute…
CVE-2023-47295 — Critical (CVSS 9.8): A CSV injection vulnerability in NCR Terminal Handler v1.5.1 allows attackers to execute arbitrary commands via…
CVE-2024-55532 — Critical (CVSS 9.8): Improper Neutralization of Formula Elements in Export CSV feature of Apache Ranger in Apache Ranger Version <…

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