How severe is CVE-2019-12737?

CVE-2019-12737 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-2019-12737 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (48th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2019-12737?

CVE-2019-12737 primarily affects Jetbrains Ktor. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2019-12737?

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

When was CVE-2019-12737 published?

CVE-2019-12737 was published on 2019-10-02 and last updated on 2026-06-17.

CVE-2019-12737

CVE-2019-12737 is a medium-severity vulnerability in Jetbrains Ktor 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. The underlying weakness is classified as CWE-916.

Key facts

Severity: Medium (CVSS 3.x base score 5.3)
CVSS v2: 5.0
EPSS exploit prediction: 1% (48th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-916
Affected product: Jetbrains Ktor
Published: 2019-10-02
Last modified: 2026-06-17

Description

UserHashedTableAuth in JetBrains Ktor framework before 1.2.0-rc uses a One-Way Hash with a Predictable Salt for storing user credentials.

Frequently asked questions

What is CVE-2019-12737?: UserHashedTableAuth in JetBrains Ktor framework before 1.2.0-rc uses a One-Way Hash with a Predictable Salt for storing user credentials.
How severe is CVE-2019-12737?: CVE-2019-12737 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-2019-12737 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (48th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2019-12737?: CVE-2019-12737 primarily affects Jetbrains Ktor. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2019-12737?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2019-12737 published?: CVE-2019-12737 was published on 2019-10-02 and last updated on 2026-06-17.

References

https://blog.jetbrains.com/blog/2019/09/26/jetbrains-security-bulletin-q2-2019/

Affected products (2)

cpe:2.3:a:jetbrains:ktor:*:*:*:*:*:*:*:*
cpe:2.3:a:jetbrains:ktor:1.2.0:rc:*:*:*:*:*:*

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