NGINX ngx_mail_smtp_module vulnerability (F5 NGINX Plus)
At a glance
- Source
- NVD
- EPSS
- EPSS 0.41 % · percentile 36 ()
- State
- PUBLISHED
- Published
- Updated
- Assigner
- f5
- NVD status
- Modified
Description
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.
Weaknesses (CWE)
- CWE-125 — Out-of-bounds Read
References
Scores
| Version | Score | Vector | Scored by |
|---|---|---|---|
| CVSS 3.1 | LOW 3.7 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N | f5 |
| CVSS 4.0 | MEDIUM 6.3 | 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 | f5 |
| CVSS 4.0 | MEDIUM 6.3 | 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X | NVD · f5sirt@f5.com (Secondary) |
| CVSS 3.1 | LOW 3.7 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N | NVD · f5sirt@f5.com (Secondary) |
European references
- ENISA EUVD · EUVD-2025-24579
- GCVE · GCVE-0-2025-53859
CERT-FR advisories
- CERTFR-2026-AVI-1056 — Multiples vulnérabilités dans les produits Splunk · cert.ssi.gouv.fr
- CERTFR-2026-AVI-0326 — Multiples vulnérabilités dans les produits VMware · cert.ssi.gouv.fr
- CERTFR-2026-AVI-0316 — Multiples vulnérabilités dans les produits VMware · cert.ssi.gouv.fr
- CERTFR-2026-AVI-0315 — Multiples vulnérabilités dans les produits VMware · cert.ssi.gouv.fr
- CERTFR-2025-AVI-0969 — Multiples vulnérabilités dans les produits VMware · cert.ssi.gouv.fr
- CERTFR-2025-AVI-0710 — Multiples vulnérabilités dans les produits F5 · cert.ssi.gouv.fr
- CERTFR-2025-AVI-0691 — Vulnérabilité dans Nginx · cert.ssi.gouv.fr
Affected configurations (NVD CPE)
cpe:2.3:a:f5:nginx_plus:r30:-:*:*:*:*:*:*cpe:2.3:a:f5:nginx_plus:r31:-:*:*:*:*:*:*cpe:2.3:a:f5:nginx_plus:r32:-:*:*:*:*:*:*cpe:2.3:a:f5:nginx_plus:r32:p1:*:*:*:*:*:*cpe:2.3:a:f5:nginx_plus:r32:p2:*:*:*:*:*:*cpe:2.3:a:f5:nginx_plus:r33:-:*:*:*:*:*:*cpe:2.3:a:f5:nginx_plus:r33:p1:*:*:*:*:*:*cpe:2.3:a:f5:nginx_plus:r33:p2:*:*:*:*:*:*cpe:2.3:a:f5:nginx_plus:r34:-:*:*:*:*:*:*cpe:2.3:a:f5:nginx_plus:r34:p1:*:*:*:*:*:*cpe:2.3:a:f5:nginx_open_source:*:*:*:*:*:*:*:*≥ 0.7.22 < 1.29.1
Affected products
| Product | Versions |
|---|---|
| F5 · NGINX Plus | unaffected R35 ; affected R34 < R34 P2 ; affected R33 < R33 P3 ; affected R32 < R32 P3 ; affected R31 < * ; affected R30 < * |
| F5 · NGINX Open Source | affected 0.7 < 1.29.1 |
Sources
| Source | Licence |
|---|---|
| CVE List (CVEProject cvelistV5) | CVE Program Terms of Use |
| EPSS (FIRST.org) | FIRST — attribution requested |
| ENISA EUVD | ENISA — reproduction authorised, source acknowledged |
| CERT-FR (ANSSI) | Licence Ouverte / Etalab 2.0 |
| NVD (NIST) via fkie-cad/nvd-json-data-feeds | Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD |