CVE-2020-9273
A public proof of concept exists; no exploitation attested.
- Published2020-02-20
- WeaknessCWE-416
Am I affected?
Debian, Ubuntu or Red Hat sometimes backport a fix without changing the upstream version number: such a version reads « to verify », never « affected ».With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.
Description
In ProFTPD 1.3.7, it is possible to corrupt the memory pool by interrupting the data transfer channel. This triggers a use-after-free in alloc_pool in pool.c, and possible remote code execution.
Timeline
dates in UTC- 2020-02-2016:15CVE publishedNVD
- 2026-10-2319:23First public proof of conceptPoC-in-GitHub
- 2026-10-2319:23EPSS crossed 10 %FIRST EPSS
Observed activity
isMalicious corpus · updated 2026-10-23 18:48 UTCBlock these indicators
- Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2020-9273?format=txt
- CSV export: https://api.ismalicious.com/edl/cve/CVE-2020-9273?format=csv
- TAXII collection of exploited CVEs
- The EDL and CSV take an API key on the Pro plan.
Versions per branch
NVD| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| 8.0 | = 8.0 | no fix published | NVD |
| 9.0 | = 9.0 | no fix published | NVD |
| 10.0 | = 10.0 | no fix published | NVD |
| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| 30.x | = 30 | no fix published | NVD |
| 31.x | = 31 | no fix published | NVD |
| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| 15.0 | = 15.0 | no fix published | NVD |
4 more products in the sources.
as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.
Distribution builds and vendor advisories
Packages from OSV.dev and products from the vendors' CSAF advisories.
version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.
Vendor advisories
Siemens SIMATIC CP (Update A)
SIMATIC CP 1543-1 (incl. SIPLUS variants) · SIMATIC CP 1545-1
Fix
- Vendor fix CISA ICSA-21-222-07 · 1 productUpdate to V3.0 or later version
- Vendor fix CISA ICSA-21-222-07 · 1 productUpdate to V1.1 or later version
- Mitigation from the vendor CISA ICSA-21-222-07 · 2 productsDisable the embedded FTP server. The server is deactivated in the default configuration
- Mitigation from the vendor CISA ICSA-21-222-07 · 2 productsLimit access to port 21/tcp to trusted IP addresses
Advisories and patches
- github.comRelease Notes
Detection
read 2026-10-23 19:23 UTC- Nuclei template
- none so far ProjectDiscovery
- Exploit-DB
- no entry Exploit-DB
Sources
- NVDCVSS 3.18.8read 2026-10-23
- NVDCVSS 2.09read 2026-10-23
- NVDweakness (CWE)CWE-416read 2026-10-23
- FIRST EPSSEPSS score12.1 %read 2026-10-23
- PoC-in-GitHubproof of concept1read 2026-10-23
Technical details
- CVSS v3 Vector
- CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Published
- 2020-02-20
- Last Modified
- 2026-06-17
- NVD status
- Modified
Frequently asked questions
What is CVE-2020-9273?
Is CVE-2020-9273 actively exploited?
What is the CVSS score for CVE-2020-9273?
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