CVE-2025-53859 (GCVE-0-2025-53859)

Vulnerability from cvelistv5 – Published: 2025-08-13 14:46 – Updated: 2025-11-04 21:12
VLAI?
Summary
NGINX Open Source and NGINX Plus have a vulnerability in the ngx_mail_smtp_module that might allow an unauthenticated attacker to over-read NGINX SMTP authentication process memory; as a result, the server side may leak arbitrary bytes sent in a request to the authentication server. This issue happens during the NGINX SMTP authentication process and requires the attacker to make preparations against the target system to extract the leaked data. The issue affects NGINX only if (1) it is built with the ngx_mail_smtp_module, (2) the smtp_auth directive is configured with method "none," and (3) the authentication server returns the "Auth-Wait" response header. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.
Severity ?
3.7 (Low)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
6.3 (Medium)
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
CWE
Assigner
f5
References
Impacted products
Vendor Product Version
F5 NGINX Plus Unaffected: R35 (custom)
Affected: R34 , < R34 P2 (custom)
Affected: R33 , < R33 P3 (custom)
Affected: R32 , < R32 P3 (custom)
Affected: R31 , < * (custom)
Affected: R30 , < * (custom)
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    F5 NGINX Open Source Affected: 0.7 , < 1.29.1 (custom)
Create a notification for this product.
Credits
F5 acknowledges the Amazon Web Services Security team for bringing this issue to our attention and following the highest standards of coordinated disclosure.
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Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.