CVE-2021-3851 json
Open Redirect in firefly-iii/firefly-iii
published 2021-10-19 5 y ago modified 2026-06-17 4 mo ago also GHSA-5fvx-5p2r-4mvp , EUVD-2021-2160
- cvss
- 5.0
- version 3.0, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.6%
- EPSS 0.6% chance of exploitation in 30 days, percentile 47%
- public exploits
- 0
- none known
Summary
firefly-iii is vulnerable to URL Redirection to Untrusted Site
Patch / fix
- packagist grumpydictator/firefly-iii 5.6.2
- firefly-iii firefly-iii/firefly-iii 5.6.2
Exploit prediction
0.57% chance of exploitation in the next 30 days, higher than 47% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- huntr.dev https://huntr.dev/bounties/549a1040-9b5e-420b-9b80-20700dd9d592 referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.0 | 5.0 | CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:L |
| NVD | 3.1 | 5.4 | CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N |
| NVD | 2.0 | 4.9 | AV:N/AC:M/Au:S/C:P/I:P/A:N |
| GitHub | 3.0 | 5.0 | CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:L |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| packagist | grumpydictator/firefly-iii | <5.6.2 |
5.6.2 |
Affected products
- firefly-iii firefly-iii/firefly-iii
Classification
- Weakness
-
- CWE-601 URL Redirection to Untrusted Site
References
-
github.com
/firefly-iii/firefly-iii/commit/8662dfa4c0f71efef61c31dc015c6f723db8318d
web, patch, third-party-advisory
-
huntr.dev
/bounties/549a1040-9b5e-420b-9b80-20700dd9d592
web, exploit, patch, third-party-advisory
-
nvd.nist.gov
/vuln/detail/CVE-2021-3851
advisory
-
github.com
/firefly-iii/firefly-iii
web
Sources
- CVE List CVE-2021-3851
- GitHub Advisory GHSA-5fvx-5p2r-4mvp
- NVD CVE-2021-3851
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.