CVE-2009-3639

mediumpriority · track · 25EPSS 0.057 · 93 %ileEUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

5.70% (93rd) EPSS

CVSS 5.8 · medium

Is it mine?

5 products

Check your exposure

Who says so?

2 sources

enisa_euvd · nvd

EPSS · scored 2026-10-27

The mod_tls module in ProFTPD before 1.3.2b, and 1.3.3 before 1.3.3rc2, when the dNSNameRequired TLS option is enabled, does not properly handle a '\0' character in a domain name in the Subject Alternative Name field of an X.509 client certificate, which allows remote attackers to bypass intended client-hostname restrictions via a crafted certificate issued by a legitimate Certification Authority, a related issue to CVE-2009-2408.

cvss

Technical severity, 0–10. One row per scoring source.

5.8

010

base score 0–10 · higher = more severe · hover a vector to decode

v2.05.8mediumAV:N/AC:M/Au:N/C:N/I:P/A:Pprimary · NVD / NIST USexploitability 8.6 · impact 4.9

v2.04.9mediumAV:N/AC:M/Au:N/C:N/I:P/A:P/E:Usecondary · CVSS-BT (t0sche)

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-310USprimary

affected products (5)

Products and version ranges known to be affected.

n/a n/a≤ n/aenisa_euvdEU
proftpd proftpd≤ 1.3.2nvdUScpe:2.3:a:proftpd:proftpd:*:*:*:*:*:*:*:*
proftpd proftpd= 1.3.1nvdUScpe:2.3:a:proftpd:proftpd:*:*:*:*:*:*:*:*
proftpd proftpd= 1.3.2nvdUScpe:2.3:a:proftpd:proftpd:*:*:*:*:*:*:*:*
proftpd proftpd= 1.3.3nvdUScpe:2.3:a:proftpd:proftpd:*:*:*:*:*:*:*:*

also known as (2)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

enisa_euvd nvd NVD CVE.org MITRE

published 2009-10-28modified 2026-06-16

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references (24)

External citations — patches, advisories, analysis.

scry

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