Vulnerability Details : CVE-2020-35680
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.
Vulnerability category: Memory CorruptionDenial of service
Products affected by CVE-2020-35680
- cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:*
- cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*
- cpe:2.3:a:opensmtpd:opensmtpd:*:*:*:*:*:*:*:*
- cpe:2.3:a:opensmtpd:opensmtpd:6.8.0:-:*:*:*:*:*:*
- cpe:2.3:a:opensmtpd:opensmtpd:6.8.0:patch1-rc1:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2020-35680
4.23%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 88 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2020-35680
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
5.0
|
MEDIUM | AV:N/AC:L/Au:N/C:N/I:N/A:P |
10.0
|
2.9
|
NIST | |
|
7.5
|
HIGH | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
3.9
|
3.6
|
NIST |
CWE ids for CVE-2020-35680
-
The product dereferences a pointer that it expects to be valid but is NULL.Assigned by: nvd@nist.gov (Primary)
References for CVE-2020-35680
-
https://poolp.org/posts/2020-12-24/december-2020-opensmtpd-6.8.0p1-released-fixed-several-bugs-proposed-several-diffs-book-is-on-github/
December 2020: OpenSMTPD 6.8.0p1 released, fixed several bugs, proposed several diffs, book is on Github - poolp.orgThird Party Advisory
-
https://github.com/openbsd/src/commit/6c3220444ed06b5796dedfd53a0f4becd903c0d1
smtpd's filter state machine can prematurely release resources · openbsd/src@6c32204 · GitHubPatch;Third Party Advisory
-
https://www.mail-archive.com/misc@opensmtpd.org/msg05188.html
Announce: OpenSMTPD 6.8.0p1 releasedRelease Notes;Third Party Advisory
-
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/5LKTFBQCHGMVPR4IZWHQIYAPM5J3LN3J/
[SECURITY] Fedora 33 Update: opensmtpd-6.8.0p2-1.fc33 - package-announce - Fedora Mailing-ListsMailing List;Third Party Advisory
-
https://security.gentoo.org/glsa/202105-12
OpenSMTPD: Multiple vulnerabilities (GLSA 202105-12) — Gentoo securityThird Party Advisory
-
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/TYAYXRV2DM5K4RU7RHCDZSA2UF6VCTRC/
[SECURITY] Fedora 32 Update: opensmtpd-6.8.0p2-1.fc32 - package-announce - Fedora Mailing-ListsMailing List;Third Party Advisory
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