Is CVE-2023-51765 in the CISA KEV catalog?

No. CVE-2023-51765 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2023-51765?

CVE-2023-51765 has a CVSS v3 base score of 5.3 (MEDIUM).

What is the EPSS score for CVE-2023-51765?

CVE-2023-51765 has an EPSS score of 1.07% (61th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2023-51765?

Upgrade sendmail on debian 11 to 8.15.2-22+deb11u1 or later.

CVE & CISA-KEV Catalog

CVE-2023-51765

MEDIUM

5.3

CVSS v3

NVD

Description

sendmail through 8.17.2 allows SMTP smuggling in certain configurations. Remote attackers can use a published exploitation technique to inject e-mail messages with a spoofed MAIL FROM address, allowing bypass of an SPF protection mechanism. This occurs because sendmail supports <LF>.<CR><LF> but some other popular e-mail servers do not. This is resolved in 8.18 and later versions with 'o' in srv_features.

CWE-345

How to fix

Remediation Available

sendmailDebian

Fixed in:8.15.2-22+deb11u1CVE-2023-51765

Fixed in:8.17.1.9-2+deb12u1CVE-2023-51765

Fixed in:8.18.1-1CVE-2023-51765

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

IntegrityLow

AvailabilityNone

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

Exploit Intelligence

1.07%probability of exploitation in 30 days

61stpercentile

Moderate risk: more likely to be exploited than 61% of all known CVEs.

References

Patch2

Exploit1

youtube.com

Third-Party Advisory11

Technical Description1

fahrplan.events.ccc.de

Other references2

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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.