How severe is CVE-2021-4005?

CVE-2021-4005 has a CVSS 3.x base score of 4.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity low, and availability none.

Is CVE-2021-4005 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (35th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-4005?

CVE-2021-4005 affects Firefly-iii Firefly Iii. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-4005?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2021-4005 published?

CVE-2021-4005 was published on 2021-12-04 and last updated on 2026-06-17.

CVE-2021-4005

CVE-2021-4005 is a medium-severity vulnerability in Firefly-iii Firefly Iii with a CVSS 3.x base score of 4.3. 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-352.

Key facts

Severity: Medium (CVSS 3.x base score 4.3)
CVSS v2: 4.3
EPSS exploit prediction: 0% (35th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-352
Affected product: Firefly-iii Firefly Iii
Published: 2021-12-04
Last modified: 2026-06-17

Description

firefly-iii is vulnerable to Cross-Site Request Forgery (CSRF)

Frequently asked questions

What is CVE-2021-4005?: firefly-iii is vulnerable to Cross-Site Request Forgery (CSRF)
How severe is CVE-2021-4005?: CVE-2021-4005 has a CVSS 3.x base score of 4.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity low, and availability none.
Is CVE-2021-4005 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (35th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-4005?: CVE-2021-4005 affects Firefly-iii Firefly Iii. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-4005?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-4005 published?: CVE-2021-4005 was published on 2021-12-04 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:firefly-iii:firefly_iii:*:*:*:*:*:*:*:*

More vulnerabilities in Firefly-iii Firefly Iii

CVE-2023-1788 — Critical (CVSS 9.8): Insufficient Session Expiration in GitHub repository firefly-iii/firefly-iii prior to 6.
CVE-2023-1789 — Critical (CVSS 9.8): Improper Input Validation in GitHub repository firefly-iii/firefly-iii prior to 6.0.0.
CVE-2021-3901 — High (CVSS 8.8): firefly-iii is vulnerable to Cross-Site Request Forgery (CSRF)
CVE-2021-3846 — High (CVSS 8.8): firefly-iii is vulnerable to Unrestricted Upload of File with Dangerous Type
CVE-2021-3819 — High (CVSS 8.8): firefly-iii is vulnerable to Cross-Site Request Forgery (CSRF)
CVE-2021-3663 — High (CVSS 7.5): firefly-iii is vulnerable to Improper Restriction of Excessive Authentication Attempts

All CVEs affecting Firefly-iii Firefly Iii →

Other CWE-352 (Cross-Site Request Forgery (CSRF)) vulnerabilities

CVE-2025-32642 — Critical (CVSS 10.0): Cross-Site Request Forgery (CSRF) vulnerability in appsbd Vite Coupon vite-coupon allows Remote Code Inclusion.This…
CVE-2025-23922 — Critical (CVSS 10.0): Cross-Site Request Forgery (CSRF) vulnerability in Harsh iSpring Embedder embed-ispring allows Upload a Web Shell to a…
CVE-2017-5145 — Critical (CVSS 10.0): An issue was discovered in Carlo Gavazzi VMU-C EM prior to firmware Version A11_U05, and VMU-C PV prior to firmware…
CVE-2019-25729 — Critical (CVSS 9.8): PDF Signer 3.0 contains a server-side template injection vulnerability that allows unauthenticated attackers to execute…
CVE-2025-48340 — Critical (CVSS 9.8): Cross-Site Request Forgery (CSRF) vulnerability in Danny Vink User Profile Meta Manager user-profile-meta allows…
CVE-2025-2907 — Critical (CVSS 9.8): The Order Delivery Date WordPress plugin before 12.3.1 does not have authorization and CSRF checks when importing…

Browse all CWE-352 (Cross-Site Request Forgery (CSRF)) vulnerabilities →