How severe is CVE-2021-31911?

CVE-2021-31911 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2021-31911 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (50th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-31911?

CVE-2021-31911 affects Jetbrains Teamcity. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-31911?

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

When was CVE-2021-31911 published?

CVE-2021-31911 was published on 2021-05-11 and last updated on 2026-06-17.

CVE-2021-31911

CVE-2021-31911 is a medium-severity vulnerability in Jetbrains Teamcity with a CVSS 3.x base score of 6.1. 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-79.

Key facts

Severity: Medium (CVSS 3.x base score 6.1)
CVSS v2: 4.3
EPSS exploit prediction: 1% (50th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Jetbrains Teamcity
Published: 2021-05-11
Last modified: 2026-06-17

Description

In JetBrains TeamCity before 2020.2.3, reflected XSS was possible on several pages.

Frequently asked questions

What is CVE-2021-31911?: In JetBrains TeamCity before 2020.2.3, reflected XSS was possible on several pages.
How severe is CVE-2021-31911?: CVE-2021-31911 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2021-31911 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (50th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-31911?: CVE-2021-31911 affects Jetbrains Teamcity. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-31911?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-31911 published?: CVE-2021-31911 was published on 2021-05-11 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:jetbrains:teamcity:*:*:*:*:*:*:*:*

More vulnerabilities in Jetbrains Teamcity

CVE-2024-27198 — Critical (CVSS 9.8): In JetBrains TeamCity before 2023.11.4 authentication bypass allowing to perform admin actions was possible
CVE-2024-23917 — Critical (CVSS 9.8): In JetBrains TeamCity before 2023.11.3 authentication bypass leading to RCE was possible
CVE-2023-42793 — Critical (CVSS 9.8): In JetBrains TeamCity before 2023.05.4 authentication bypass leading to RCE on TeamCity Server was possible
CVE-2022-25263 — Critical (CVSS 9.8): JetBrains TeamCity before 2021.2.3 was vulnerable to OS command injection in the Agent Push feature configuration.
CVE-2022-24340 — Critical (CVSS 9.8): In JetBrains TeamCity before 2021.2.1, XXE during the parsing of the configuration file was possible.
CVE-2022-24331 — Critical (CVSS 9.8): In JetBrains TeamCity before 2021.1.4, GitLab authentication impersonation was possible.

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