How severe is CVE-2021-26310?

CVE-2021-26310 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2021-26310 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (72nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-26310?

CVE-2021-26310 affects Jetbrains Teamcity. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-26310?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2021-26310 published?

CVE-2021-26310 was published on 2021-05-11 and last updated on 2026-06-17.

CVE-2021-26310

CVE-2021-26310 is a high-severity vulnerability in Jetbrains Teamcity with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 2% (72nd percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Jetbrains Teamcity
Published: 2021-05-11
Last modified: 2026-06-17

Description

In the TeamCity IntelliJ plugin before 2020.2.2.85899, DoS was possible.

Frequently asked questions

What is CVE-2021-26310?: In the TeamCity IntelliJ plugin before 2020.2.2.85899, DoS was possible.
How severe is CVE-2021-26310?: CVE-2021-26310 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2021-26310 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (72nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-26310?: CVE-2021-26310 affects Jetbrains Teamcity. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-26310?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2021-26310 published?: CVE-2021-26310 was published on 2021-05-11 and last updated on 2026-06-17.

References

Affected products (1)

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

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