CVE catalog
CVE-2020-35680
opensmtpd: CVE-2020-35680
- Severity
- Medium
- Published
- Source
- [NVD] · [CVE record]
- EPSS
- 3.65% · Oct 25, 2026
smtpd/lka_filter.c in OpenSMTPD before 6.8.0p1, in certain configurations, allows remote attackers to cause a denial of service (NULL pointer dereference and daemon crash) via a crafted pattern of client activity, because the filter state machine does not properly maintain the I/O channel between the SMTP engine and the filters layer.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Debian | opensmtpd | sid | 7.9.0p0-1 | fixed |
| Debian | opensmtpd | forky | 7.9.0p0-1 | fixed |
| Debian | opensmtpd | trixie | 7.6.0p1-1 | fixed |
| Debian | opensmtpd | bookworm | 6.8.0p2-4 | fixed |
| Alpine | opensmtpd | 3.11 | 6.6.4p1-r1 | fixed |
| Alpine | opensmtpd | 3.12 | 6.6.4p1-r2 | fixed |
| Alpine | opensmtpd | 3.13 | 6.7.1p1-r1 | fixed |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | opensmtpd | source | sid | 6.8.0p2-1 | not yet assigned | Not reported | [978039] |
| Debian | opensmtpd | source | forky | 6.8.0p2-1 | not yet assigned | Not reported | [978039] |
| Debian | opensmtpd | source | trixie | 6.8.0p2-1 | not yet assigned | Not reported | [978039] |
| Debian | opensmtpd | source | bookworm | 6.8.0p2-1 | not yet assigned | Not reported | [978039] |
| Alpine | opensmtpd | apk | 3.11 | 6.6.4p1-r1 | Not reported | ALPINE-CVE-2020-35680 | Not reported |
| Alpine | opensmtpd | apk | 3.12 | 6.6.4p1-r2 | Not reported | ALPINE-CVE-2020-35680 | Not reported |
| Alpine | opensmtpd | apk | 3.13 | 6.7.1p1-r1 | Not reported | ALPINE-CVE-2020-35680 | Not reported |
OpenFactory catalog packages
[Debian 12 (Bookworm)]
- [opensmtpd]Fixed
Details (4)
6.8.0p2-4+b4· amd64 · bookwormFixed · Fixed:
6.8.0p2-1dsa · opensmtpd · debian · bookworm; dsa · opensmtpd · debian · 12
6.8.0p2-4+b4· arm64 · bookwormFixed · Fixed:
6.8.0p2-1dsa · opensmtpd · debian · bookworm; dsa · opensmtpd · debian · 12
7.4.0p1-1~bpo12+1· amd64 · bookworm-backportsFixed · Fixed:
6.8.0p2-1dsa · opensmtpd · debian · bookworm; dsa · opensmtpd · debian · 12
7.4.0p1-1~bpo12+1· arm64 · bookworm-backportsFixed · Fixed:
6.8.0p2-1dsa · opensmtpd · debian · bookworm; dsa · opensmtpd · debian · 12
[Debian 13 (Trixie)]
- [opensmtpd]Fixed
Details (2)
7.6.0p1-1· amd64 · trixieFixed · Fixed:
6.8.0p2-1dsa · opensmtpd · debian · 13
7.6.0p1-1· arm64 · trixieFixed · Fixed:
6.8.0p2-1dsa · opensmtpd · debian · 13
Observed: