CVE-2023-51764Not scoredCWE-345

CVE-2023-51764: Postfix vulnerability

Postfix

Vendor fix available · Affected: Postfix · Exploitation: possible (1 to 10%)

Not in CyberSIXT coverage yet: no article names this CVE. This page shows the public record.

2.6%probability of exploitation in the next 30 days

85th percentile

050100

Higher than 85% of scored CVEs

Not scored yet. The CVE record carries no CVSS score.

DescriptionCVE.org

Postfix through 3.8.5 allows SMTP smuggling unless configured with smtpd_data_restrictions=reject_unauth_pipelining and smtpd_discard_ehlo_keywords=chunking (or certain other options that exist in recent versions). 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 Postfix supports <LF>.<CR><LF> but some other popular e-mail servers do not. To prevent attack variants (by always disallowing <LF> without <CR>), a different solution is required, such as the smtpd_forbid_bare_newline=yes option with a Postfix minimum version of 3.5.23, 3.6.13, 3.7.9, 3.8.4, or 3.9.

On the Atlas

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Open the Atlas

Exploitation: Possible (1 to 10%). EPSS between 1% and 10%.
CISA KEV: Not listed
Public check: No public nuclei template
Weakness: Insufficient Verification of Data Authenticity · Cryptography
Vendor: Postfix
Published: December 2023
Band: Possible (1 to 10%), December 2023

CoverageNo articles yet

No CyberSIXT article names CVE-2023-51764 yet, so there is no coverage timeline, action brief or change log for it. Everything on this page comes from the public CVE record, CISA KEV, EPSS and the nuclei template index. Search the archive or see the CVEs in the news.

References

7 more references are in the CVE record.