How severe is CVE-2010-4237?

CVE-2010-4237 has a CVSS 3.x base score of 5.9, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability none.

Is CVE-2010-4237 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (53rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2010-4237?

CVE-2010-4237 affects Mercurial. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2010-4237?

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

When was CVE-2010-4237 published?

CVE-2010-4237 was published on 2019-10-29 and last updated on 2026-06-16.

CVE-2010-4237

CVE-2010-4237 is a medium-severity vulnerability in Mercurial with a CVSS 3.x base score of 5.9. 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-295.

Key facts

Severity: Medium (CVSS 3.x base score 5.9)
CVSS v2: 4.3
EPSS exploit prediction: 1% (53rd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-295
Affected product: Mercurial
Published: 2019-10-29
Last modified: 2026-06-16

Description

Mercurial before 1.6.4 fails to verify the Common Name field of SSL certificates which allows remote attackers who acquire a certificate signed by a Certificate Authority to perform a man-in-the-middle attack.

Frequently asked questions

What is CVE-2010-4237?: Mercurial before 1.6.4 fails to verify the Common Name field of SSL certificates which allows remote attackers who acquire a certificate signed by a Certificate Authority to perform a man-in-the-middle attack.
How severe is CVE-2010-4237?: CVE-2010-4237 has a CVSS 3.x base score of 5.9, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability none.
Is CVE-2010-4237 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (53rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2010-4237?: CVE-2010-4237 affects Mercurial. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2010-4237?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2010-4237 published?: CVE-2010-4237 was published on 2019-10-29 and last updated on 2026-06-16.

References

Affected products (1)

cpe:2.3:a:mercurial:mercurial:*:*:*:*:*:*:*:*

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