CVE-2019-19269: An issue was discovered in tls_verify_crl in ProFTPD through 1.3.6b.
Noroxi assessment
Priority: Monitor (action score 19/100)
- The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
- Probability of exploitation in the next 30 days: 1.6% (FIRST EPSS); higher than 76.3% of all records.
- Anyone who can reach it over the internet can trigger it. Administrator privileges are required. No user action is required. No special conditions are required; it is repeatable.
- Fixed version: proftpd-dfsg (Debian:12) 1.3.6b-2; proftpd-dfsg (Debian:8) 1.3.5e+r1.3.5-2+deb8u5; proftpd (openSUSE:Leap 15.1) 1.3.6b-bp151.4.6.2.
- Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).
Low priority for now. Upgrade to proftpd-dfsg (Debian:12) 1.3.6b-2; proftpd-dfsg (Debian:8) 1.3.5e+r1.3.5-2+deb8u5; proftpd (openSUSE:Leap 15.1) 1.3.6b-bp151.4.6.2 or later.
Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it
Primary sources: NVD · CVE.org · FIRST EPSS
An issue was discovered in tls_verify_crl in ProFTPD through 1.3.6b. A dereference of a NULL pointer may occur. This pointer is returned by the OpenSSL sk_X509_REVOKED_value() function when encountering an empty CRL installed by a system administrator. The dereference occurs when validating the certificate of a client connecting to the server in a TLS client/server mutual-authentication setup.
- Published
- Nov 30, 2019
- Updated
- Jun 16, 2026
- EPSS
- 1.6% · 76th percentile
- CWE
- CWE-476
Report tools
Action score
19
Monitor
Low priority for now.
- CVSS
- 19 / 40 · 4.9 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 0 / 30 · 1.6%
Get told when this record changes
- Not in KEV: no record of exploitation in the wild
- No public exploit code on record
- A fix has been released
If any of these changes, we'll tell you in the daily email digest.
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Noroxi analysis
What does it mean in your environment?
The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.
We use this product, ask for helpAffected systems
Is your version affected?
Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.
| Vendor | Product | CPE |
|---|---|---|
| proftpd | proftpd | cpe:2.3:a:proftpd:proftpd |
| fedoraproject | fedora | cpe:2.3:o:fedoraproject:fedora |
| debian | debian linux | cpe:2.3:o:debian:debian_linux |
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- debian debian linux8.0
- fedoraproject fedora30
- fedoraproject fedora31
- proftpd proftpdup to 1.3.5e inclusive
- proftpd proftpd1.3.6
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| Debian:12 | proftpd-dfsg | before 1.3.6b-2 | 1.3.6b-2 |
| Debian:8 | proftpd-dfsg | before 1.3.5e+r1.3.5-2+deb8u5 | 1.3.5e+r1.3.5-2+deb8u5 |
| openSUSE:Leap 15.1 | proftpd | before 1.3.6b-bp151.4.6.2 | 1.3.6b-bp151.4.6.2 |
| openSUSE:Tumbleweed | proftpd | before 1.3.6e-1.10 | 1.3.6e-1.10 |
| SUSE:Package Hub 15 | proftpd | before 1.3.6b-bp151.4.6.2 | 1.3.6b-bp151.4.6.2 |
Same product
proftpd: all recordsOther highest-scoring records for the same primary product.
- CVE-2015-3306The mod_copy module in ProFTPD 1.3.5 allows remote attackers to read and write to arbitrary files via the site cpfr and site cpto commands.KEV100Now
- CVE-2010-4221Multiple stack-based buffer overflows in the pr_netio_telnet_gets function in netio.c in ProFTPD before 1.3.3c allow remote attackers to exe67This week
- CVE-2010-20103ProFTPD 1.3.3c Backdoor Command Execution60This week
Published before and after this one in the same product
- ← EarlierCVE-2019-19271Nov 26, 2019 · An issue was discovered in tls_verify_crl in ProFTPD before 1.3.6.30Monitor
- ← EarlierCVE-2019-19272Nov 26, 2019 · An issue was discovered in tls_verify_crl in ProFTPD before 1.3.6.30Monitor
- Later →CVE-2020-9272Feb 20, 2020 · ProFTPD 1.3.7 has an out-of-bounds (OOB) read vulnerability in mod_cap via the cap_text.c cap_to_text function.31Monitor
Remediation
Which version to upgrade to
Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.
| Product / package | Fixed version | Source |
|---|---|---|
| debian:proftpd-dfsg | 1.3.6b-2 · Debian:12 | Package registry (OSV) |
| opensuse:proftpd | 1.3.6b-bp151.4.6.2 · openSUSE:Leap 15.1 | Package registry (OSV) |
| suse:proftpd | 1.3.6b-bp151.4.6.2 · SUSE:Package Hub 15 | Package registry (OSV) |
Exploit status
No known public exploit
No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.
Research context
For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.
Timeline
From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.
No dated events beyond publication.
No history yet (it accumulates with the daily EPSS job).
Patch and commit links
Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.
No commit or PR link among the references.
Credits
All researchersFinders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.
No credits in the CNA record.
Variant candidates
Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.
No nightly-computed relations.
Chain candidates
An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.
—
Bug bounty scope
No known public program.
Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).
National notice (Türkiye Cybersecurity Directorate / USOM)
Official security notices citing this record; remediation advice is on the agency's page.
- TR-20-633 · Aug 24, 2020(Proftpd Sunucu Güvenlik Güncellemesi)
Technical details
Attack conditions
- Anyone who can reach it over the internet can trigger it.
- Administrator privileges are required.
- No user action is required.
- No special conditions are required; it is repeatable.
If successful
- Confidentiality
- none
- Integrity
- none
- Availability
- high · the service can be disrupted
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- High
- User interaction
- None
- Scope
- Unchanged
- Confidentiality impact
- None
- Integrity impact
- None
- Availability impact
- High
Weakness class (CWE)
CWE-476 · NULL Pointer DereferenceCVSS vector
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
nvd-primary
Attack context
MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.
MITRE has no CAPEC/ATT&CK mapping for this CWE.
Change log
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
Show all references (6 more)Show less
- github.com/proftpd/proftpd/issues/861
- lists.debian.org/debian-lts-announce/2019/11/msg00039.html
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/OGBBCPLJSDPFG5EI5P5G7P4KEX7YSD5G/
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QR65XUHPCRU3NXTSFVF2J4GWRIHC7AHW/
- security.gentoo.org/glsa/202003-35
- www.oracle.com/security-alerts/cpuapr2020.html
Vendor advisories and official records. Exploit/PoC links are deliberately left out.