How severe is CVE-2019-15237?

CVE-2019-15237 has a CVSS 3.x base score of 7.4, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity high, and availability none.

Is CVE-2019-15237 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (56th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2019-15237?

CVE-2019-15237 primarily affects Roundcube Webmail. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2019-15237?

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-2019-15237 published?

CVE-2019-15237 was published on 2019-08-20 and last updated on 2026-06-17.

CVE-2019-15237

CVE-2019-15237 is a high-severity vulnerability in Roundcube Webmail with a CVSS 3.x base score of 7.4. 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 7.4)
CVSS v2: 4.3
EPSS exploit prediction: 1% (56th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Roundcube Webmail
Published: 2019-08-20
Last modified: 2026-06-17

Description

Roundcube Webmail through 1.3.9 mishandles Punycode xn-- domain names, leading to homograph attacks.

Frequently asked questions

What is CVE-2019-15237?: Roundcube Webmail through 1.3.9 mishandles Punycode xn-- domain names, leading to homograph attacks.
How severe is CVE-2019-15237?: CVE-2019-15237 has a CVSS 3.x base score of 7.4, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity high, and availability none.
Is CVE-2019-15237 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (56th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2019-15237?: CVE-2019-15237 primarily affects Roundcube Webmail. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2019-15237?: 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-2019-15237 published?: CVE-2019-15237 was published on 2019-08-20 and last updated on 2026-06-17.

References

Affected products (2)

cpe:2.3:a:roundcube:webmail:*:*:*:*:*:*:*:*
cpe:2.3:o:fedoraproject:fedora:29:*:*:*:*:*:*:*

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