Security readout for executives and security teams
Plain-English summary
This CVE can crash vulnerable ProFTPD servers during TLS client-certificate validation. Business impact is availability loss for affected FTP services, not disclosed data theft or code execution. The risk is most relevant where ProFTPD is exposed and configured for mutual TLS with certificate revocation checking.
Executive priority
Handle as a targeted availability issue. It is not evidenced as critical or actively exploited, but exposed file-transfer services can be operationally important. Prioritize affected internet-facing or business-critical ProFTPD servers.
Technical view
In ProFTPD before 1.3.6, tls_verify_crl can directly dereference a NULL pointer while validating a connecting client's certificate in a TLS mutual-authentication setup. The disclosed result is a server crash during certificate validation. The bundle provides no CVSS, CWE, or proof of active exploitation.
Likely exposure
Exposure appears limited to ProFTPD deployments older than 1.3.6 using TLS client/server mutual authentication and client certificate validation with CRL handling. Generic ProFTPD installations without that TLS mutual-authentication path may not be exposed based on the provided description.
Exploitation context
The source bundle describes a crash condition but does not cite public weaponization, broad exploitation, or CISA KEV listing. Treat this as a denial-of-service risk until vendor or incident evidence shows otherwise.
Researcher notes
Key missing data: CVSS score, CWE mapping, detailed exploit prerequisites, and explicit mitigation guidance beyond the affected-version boundary. Validation should focus on version and TLS mutual-authentication configuration, not crash-testing production systems.
Mitigation direction
- Upgrade ProFTPD deployments older than 1.3.6 to version 1.3.6 or later.
- Prioritize internet-facing FTP services using TLS mutual authentication.
- Review the ProFTPD issue and vendor guidance before changing TLS or CRL behavior.
- Monitor affected services for unexpected ProFTPD crashes during client certificate validation.
Validation and detection
- Inventory ProFTPD versions across servers and containers.
- Check whether TLS client-certificate mutual authentication is enabled.
- Check whether client certificate revocation list validation is configured.
- Review logs for crashes tied to TLS client certificate validation.
- Confirm upgraded hosts report ProFTPD 1.3.6 or later.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CVE-2019-19272 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS and timeline data
No CVSS vectors or timeline events were available in the normalized CVE source material.
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/proftpd/proftpd/issues/858CVE reference · x_refsource_MISC
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.