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Fencer Intel
medium 5.3

CVE-2021-39125 json

Affected versions of Atlassian Jira Server and Data Center allow anonymous remote attackers to discover the usernames of users via an enume…

published 5y ago modified 4mo ago also EUVD-2021-25561

cvss
5.3
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
2.0%
EPSS 2.0% chance of exploitation in 30 days, percentile 81%
public exploits
0
none known

Summary

Affected versions of Atlassian Jira Server and Data Center allow anonymous remote attackers to discover the usernames of users via an enumeration vulnerability in the password reset page. The affected versions are before version 8.5.10, and from version 8.6.0 before 8.13.1.

Patch / fix

  • Atlassian Jira Server 8.5.10, 8.13.1
  • Atlassian Jira Data Center 8.5.10, 8.13.1
  • atlassian jira_server 8.5.10, 8.13.1
  • atlassian jira_data_center 8.5.10, 8.13.1

Is CVE-2021-39125 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
2y ago

Exploit prediction

2.04% chance of exploitation in the next 30 days, higher than 81% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
CISA ADP 3.1 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
NVD 3.1 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
CNA 3.1 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:P/I:N/A:N

Affected products

  • Atlassian Jira Server
  • Atlassian Jira Data Center
  • atlassian jira_server
  • atlassian jira_data_center

References

Sources

Fencer Intel 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.