How severe is CVE-2023-34339?

CVE-2023-34339 has a CVSS 3.x base score of 3.3, rated low severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.

Is CVE-2023-34339 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (11th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2023-34339?

CVE-2023-34339 affects Jetbrains Ktor. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2023-34339?

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

When was CVE-2023-34339 published?

CVE-2023-34339 was published on 2023-06-01 and last updated on 2026-06-17.

CVE-2023-34339

CVE-2023-34339 is a low-severity vulnerability in Jetbrains Ktor with a CVSS 3.x base score of 3.3. 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-209.

Key facts

Severity: Low (CVSS 3.x base score 3.3)
EPSS exploit prediction: 0% (11th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-209
Affected product: Jetbrains Ktor
Published: 2023-06-01
Last modified: 2026-06-17

Description

In JetBrains Ktor before 2.3.1 headers containing authentication data could be added to the exception's message

Frequently asked questions

What is CVE-2023-34339?: In JetBrains Ktor before 2.3.1 headers containing authentication data could be added to the exception's message
How severe is CVE-2023-34339?: CVE-2023-34339 has a CVSS 3.x base score of 3.3, rated low severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.
Is CVE-2023-34339 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (11th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2023-34339?: CVE-2023-34339 affects Jetbrains Ktor. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2023-34339?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2023-34339 published?: CVE-2023-34339 was published on 2023-06-01 and last updated on 2026-06-17.

References

https://www.jetbrains.com/privacy-security/issues-fixed/

Affected products (1)

cpe:2.3:a:jetbrains:ktor:*:*:*:*:*:*:*:*

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