How severe is CVE-2021-25756?

CVE-2021-25756 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-2021-25756 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (67th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-25756?

CVE-2021-25756 affects Jetbrains Intellij Idea. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-25756?

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

When was CVE-2021-25756 published?

CVE-2021-25756 was published on 2021-02-03 and last updated on 2026-06-17.

CVE-2021-25756

CVE-2021-25756 is a medium-severity vulnerability in Jetbrains Intellij Idea 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% (67th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Jetbrains Intellij Idea
Published: 2021-02-03
Last modified: 2026-06-17

Description

In JetBrains IntelliJ IDEA before 2020.2, HTTP links were used for several remote repositories instead of HTTPS.

Frequently asked questions

What is CVE-2021-25756?: In JetBrains IntelliJ IDEA before 2020.2, HTTP links were used for several remote repositories instead of HTTPS.
How severe is CVE-2021-25756?: CVE-2021-25756 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-2021-25756 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (67th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-25756?: CVE-2021-25756 affects Jetbrains Intellij Idea. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-25756?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-25756 published?: CVE-2021-25756 was published on 2021-02-03 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:jetbrains:intellij_idea:*:*:*:*:*:*:*:*

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