CVE-2020-9273: debian debian_linux Use After Free
Vulnerability summary
CVE-2020-9273 is a high (CVSS 9.0) Use After Free vulnerability in debian debian_linux. EPSS estimates a 11.82% chance of exploitation in the next 30 days, higher than 96% of scored vulnerabilities.
Not severe (CVSS 8.8, network access); no exploitation reported by the 5 checked sources
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 2 · Related 2Timeline
- 20-02-2020PublishedVulnerability first disclosed.
- 04-08-2024Last modifiedVulnerability information updated.
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.
CVSS metrics
4 scores · 3 sources · 2 versions- OSV · DebianEcosystem advisory · calculated8.8HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- NVDNIST8.8HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS trend
Probability
11.82%
Chance of exploitation in the next 30 days
Percentile
96%
Versus all other CVEs
30-day change
Decrease -0.32 pp
From 12.14% on 04-10-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Known conditions: network-reachable, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.
Debian2 products
- proftpd-dfsg< 1.3.5b-4+deb9u4 | < 1.3.6-4+deb10u4 | < 1.3.5e+r1.3.5-2+deb8u6 | < 1.3.5e+r1.3.5-2+deb8u7 | < 1.3.6c-2
- debian_linuxEOL8.0 | 9.0 | 10.0
Opensuse2 products
- backports_sle15.0 | 15.0:sp1
- leapEOL15.1
Siemens2 products
Fedoraproject1 product
- fedoraEOL30 | 31
Mageia1 product
- proftpd< 1.3.5e-4.3.mga7
Proftpd1 product
- proftpdEOL1.3.7
Ubuntu1 product
- proftpd-dfsgAll versions (No fix recorded)
7 vendors · 10 products
References
19 links- github.com/proftpd/proftpd/blob/master/RELEASE_NOTESX Refsource CONFIRMREPORTRelease NotesThird Party Advisory
lists.debian.org/debian-lts-announce/2020/02/msg00022.htmlMailing ListX Refsource MLISTThird Party Advisory- lists.opensuse.org/opensuse-security-announce/2020-03/msg00002.htmlVendor AdvisoryX Refsource SUSEMailing ListThird Party Advisory
- lists.debian.org/debian-lts-announce/2020/03/msg00002.htmlMailing ListX Refsource MLISTThird Party Advisory