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Vulnerability details: VCID-bk4t-p8kr-5ufj
Vulnerability ID VCID-bk4t-p8kr-5ufj
Aliases CVE-2025-53859
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.
Status Published
Exploitability 0.5
Weighted Severity 3.3
Risk 1.6
Affected and Fixed Packages Package Details
Weaknesses (1)
CWE-125 Out-of-bounds Read
System Score Found at
cvssv3 3.7 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2025-53859.json
epss 0.00034 https://api.first.org/data/v1/epss?cve=CVE-2025-53859
epss 0.00034 https://api.first.org/data/v1/epss?cve=CVE-2025-53859
epss 0.00034 https://api.first.org/data/v1/epss?cve=CVE-2025-53859
epss 0.00034 https://api.first.org/data/v1/epss?cve=CVE-2025-53859
epss 0.00034 https://api.first.org/data/v1/epss?cve=CVE-2025-53859
epss 0.00034 https://api.first.org/data/v1/epss?cve=CVE-2025-53859
epss 0.00101 https://api.first.org/data/v1/epss?cve=CVE-2025-53859
epss 0.00101 https://api.first.org/data/v1/epss?cve=CVE-2025-53859
epss 0.00129 https://api.first.org/data/v1/epss?cve=CVE-2025-53859
epss 0.00129 https://api.first.org/data/v1/epss?cve=CVE-2025-53859
epss 0.00129 https://api.first.org/data/v1/epss?cve=CVE-2025-53859
epss 0.00129 https://api.first.org/data/v1/epss?cve=CVE-2025-53859
cvssv3.1 3.7 https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
cvssv3.1 3.7 https://my.f5.com/manage/s/article/K000152786
cvssv4 6.3 https://my.f5.com/manage/s/article/K000152786
ssvc Track https://my.f5.com/manage/s/article/K000152786
Reference id Reference type URL
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2025-53859.json
https://api.first.org/data/v1/epss?cve=CVE-2025-53859
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2025-53859
https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
https://my.f5.com/manage/s/article/K000152786
1111138 https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1111138
2388238 https://bugzilla.redhat.com/show_bug.cgi?id=2388238
CVE-2025-53859 https://nvd.nist.gov/vuln/detail/CVE-2025-53859
USN-7715-1 https://usn.ubuntu.com/7715-1/
No exploits are available.
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N Found at https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2025-53859.json
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N Found at https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N Found at https://my.f5.com/manage/s/article/K000152786
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: 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 Found at https://my.f5.com/manage/s/article/K000152786
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

network

adjacent

local

physical

low

high

none

present

none

low

high

none

passive

active

high

low

none

high

low

none

high

low

none

high

low

none

high

low

none

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low

none
Vector: SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2025-08-13T15:06:23Z/ Found at https://my.f5.com/manage/s/article/K000152786
Exploit Prediction Scoring System (EPSS)
Percentile 0.08092
EPSS Score 0.00034
Published At Aug. 16, 2025, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2025-08-14T08:03:42.459876+00:00 SUSE Severity Score Importer Import https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml 37.0.0