How severe is CVE-2021-39118?

CVE-2021-39118 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.

Is CVE-2021-39118 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (70th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-39118?

CVE-2021-39118 primarily affects Atlassian Data Center. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2021-39118?

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

When was CVE-2021-39118 published?

CVE-2021-39118 was published on 2021-09-14 and last updated on 2026-06-17.

CVE-2021-39118

CVE-2021-39118 is a medium-severity vulnerability in Atlassian Data Center with a CVSS 3.x base score of 5.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: Medium (CVSS 3.x base score 5.3)
CVSS v2: 5.0
EPSS exploit prediction: 1% (70th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Atlassian Data Center
Published: 2021-09-14
Last modified: 2026-06-17

Description

Affected versions of Atlassian Jira Server and Data Center allow remote attackers to discover the usernames and full names of users via an enumeration vulnerability in the /rest/api/1.0/render endpoint. The affected versions are before version 8.19.0.

Frequently asked questions

What is CVE-2021-39118?: Affected versions of Atlassian Jira Server and Data Center allow remote attackers to discover the usernames and full names of users via an enumeration vulnerability in the /rest/api/1.0/render endpoint. The affected versions are before version 8.19.0.
How severe is CVE-2021-39118?: CVE-2021-39118 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.
Is CVE-2021-39118 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (70th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-39118?: CVE-2021-39118 primarily affects Atlassian Data Center. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2021-39118?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-39118 published?: CVE-2021-39118 was published on 2021-09-14 and last updated on 2026-06-17.

References

https://jira.atlassian.com/browse/JRASERVER-72736

Affected products (2)

cpe:2.3:a:atlassian:data_center:*:*:*:*:*:*:*:*
cpe:2.3:a:atlassian:jira:*:*:*:*:*:*:*:*

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