Is CVE-2020-35680 in the CISA KEV catalog?

No. CVE-2020-35680 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2020-35680?

CVE-2020-35680 has a CVSS v3 base score of 7.5 (HIGH).

What is the EPSS score for CVE-2020-35680?

CVE-2020-35680 has an EPSS score of 3.58% (88th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2020-35680?

Upgrade opensmtpd on debian 11 to 6.8.0p2-1 or later.

CVE & CISA-KEV Catalog

CVE-2020-35680

HIGHEPSS 88th pctl

7.5

CVSS v3

NVD

Description

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.

CWE-476NULL Pointer Dereference

How to fix

Remediation Available

opensmtpdDebian

Fixed in:6.8.0p2-1CVE-2020-35680

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityHigh

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Exploit Intelligence

3.58%probability of exploitation in 30 days

88thpercentile

Elevated risk: more likely to be exploited than 88% of all known CVEs.

References

Patch1

github.com

Third-Party Advisory2

Other references3

Related Vulnerabilities

Other CWE-476 (NULL Pointer Dereference) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2023-21758	High	7.5	92%	-	Fix
CVE-2023-21547	High	7.5	88%	-	Fix
CVE-2014-3470	Medium	4.3	86%	-	Fix
CVE-2021-44224	High	8.2	82%	-	Fix
CVE-2016-0742	High	7.5	82%	-	Fix
CVE-2009-1386	Medium	5.0	80%	-	Fix

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.