How severe is CVE-2019-19271?

CVE-2019-19271 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability none.

Is CVE-2019-19271 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (62nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2019-19271?

CVE-2019-19271 affects Proftpd. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2019-19271?

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-2019-19271 published?

CVE-2019-19271 was published on 2019-11-26 and last updated on 2026-06-17.

CVE-2019-19271

CVE-2019-19271 is a high-severity vulnerability in Proftpd with a CVSS 3.x base score of 7.5. 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: High (CVSS 3.x base score 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 1% (62nd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-295
Affected product: Proftpd
Published: 2019-11-26
Last modified: 2026-06-17

Description

An issue was discovered in tls_verify_crl in ProFTPD before 1.3.6. A wrong iteration variable, used when checking a client certificate against CRL entries (installed by a system administrator), can cause some CRL entries to be ignored, and can allow clients whose certificates have been revoked to proceed with a connection to the server.

Frequently asked questions

What is CVE-2019-19271?: An issue was discovered in tls_verify_crl in ProFTPD before 1.3.6. A wrong iteration variable, used when checking a client certificate against CRL entries (installed by a system administrator), can cause some CRL entries to be ignored, and can allow clients whose certificates have been revoked to proceed with a connection to the server.
How severe is CVE-2019-19271?: CVE-2019-19271 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability none.
Is CVE-2019-19271 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (62nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2019-19271?: CVE-2019-19271 affects Proftpd. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2019-19271?: 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-2019-19271 published?: CVE-2019-19271 was published on 2019-11-26 and last updated on 2026-06-17.

References

https://github.com/proftpd/proftpd/issues/860

Affected products (1)

cpe:2.3:a:proftpd:proftpd:*:*:*:*:*:*:*:*

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Threat intelligence

Threat-intel indicators referencing this CVE:

31.36.163.95 (ipv4-addr)
106.51.92.114 (ipv4-addr)
95.87.248.223 (ipv4-addr)
41.128.181.196 (ipv4-addr)