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Fencer Vulns
medium 5.4

CVE-2021-39894 json

In all versions of GitLab CE/EE since version 8.0, a DNS rebinding vulnerability exists in Fogbugz importer which may be used by attackers…

published 2021-10-05 5 y ago modified 2026-09-08 2 mo ago also BIT-gitlab-2021-39894 , EUVD-2021-26250

cvss
5.4
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.6%
EPSS 0.6% chance of exploitation in 30 days, percentile 49%
public exploits
0
none known

Summary

In all versions of GitLab CE/EE since version 8.0, a DNS rebinding vulnerability exists in Fogbugz importer which may be used by attackers to exploit Server Side Request Forgery attacks.

Patch / fix

  • bitnami gitlab 14.1.7, 14.2.5, 14.3.1
  • gitlab gitlab 14.1.7, 14.2.5, 14.3.1
  • gitlab gitlab_enterprise 14.1.7, 14.2.5, 14.3.1
  • gitlab Arch Linux 14.3.1-1

arch linux advisories AVG-2431

Exploit prediction

0.61% chance of exploitation in the next 30 days, higher than 49% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 5.4 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
NVD 3.1 5.4 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
NVD 2.0 5.5 AV:N/AC:L/Au:S/C:P/I:P/A:N
OSV 3.1 5.4 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N

Affected packages

ecosystem package affected fixed in
bitnami gitlab
>=8.0.0, <14.1.7
>=14.2.0, <14.2.5
>=14.3.0, <14.3.1
14.1.7
14.2.5
14.3.1

Affected products

  • GitLab GitLab

Classification

Weakness
  • CWE-918 Server-Side Request Forgery
Technology feeds

References

Sources

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.

CPEs and fixed versions use Anchore's correction of NVD's data: Enhance with deb and rpm package type records.