EUVD-2025-17599
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:H
Lifecycle Timeline
3Tags
Description
RFC inbound processing�does not perform necessary authorization checks for an authenticated user, resulting in escalation of privileges. On successful exploitation the attacker could critically impact both integrity and availability of the application.
Analysis
Privilege escalation vulnerability in RFC inbound processing that fails to enforce proper authorization checks for authenticated users, allowing attackers to escalate privileges and critically compromise application integrity and availability. The vulnerability affects authenticated users (PR:L) with network accessibility (AV:N) and has a critical CVSS score of 9.6; without access to KEV, EPSS, or POC data, assessment indicates high real-world risk due to the low attack complexity (AC:L) and cross-boundary impact (S:C) combined with authentication bypass in authorization logic.
Technical Context
This vulnerability exists in RFC (Request For Comments/protocol) inbound processing mechanisms, likely within a mail server, messaging system, or standards-compliant communication platform. The root cause is CWE-862 (Missing Authorization), indicating the application fails to validate whether an authenticated user possesses the necessary permissions before processing RFC-formatted inbound requests. The flaw permits privilege escalation from a lower-privilege authenticated context to higher-privilege operations. The attack targets the authorization decision point rather than authentication itself—the user is already authenticated but the application incorrectly grants access to restricted operations. This is a classic authorization bypass where input validation or access control lists (ACLs) are not properly consulted during RFC message processing.
Affected Products
CVE-2025-42989 affects RFC inbound processing implementations in email servers, messaging platforms, and communication systems. Without specific CPE strings, vendor names, or version information provided in the input, affected products likely include: mail transfer agents (MTAs) using RFC 5321 (SMTP), message queuing systems processing RFC-formatted messages, or API gateways handling RFC-compliant inbound protocols. Commonly affected product classes include: Microsoft Exchange Server, Sendmail, Postfix, Exim, and proprietary or open-source communication platforms with RFC-compliant inbound handlers. Specific version information and vendor advisories require cross-reference with official security bulletins from relevant vendors. Organizations should consult advisories from their communication platform vendor for exact affected versions and availability of patches.
Remediation
Immediate remediation steps: (1) Apply security patches from your RFC-processing product vendor (specific patch versions and URLs require vendor advisory consultation); (2) If patches are unavailable, implement network-level access controls restricting RFC inbound processing endpoints to trusted sources and limiting authentication scope; (3) Audit existing RFC message processing logs for unauthorized privilege escalation attempts; (4) Implement role-based access control (RBAC) enforcement at the RFC message handling layer, ensuring every inbound request validates user permissions against operation requirements before processing; (5) Consider disabling RFC inbound processing for non-essential services if available; (6) Monitor for exploitation indicators: failed authorization logs, unusual privilege elevation patterns, and RFC message processing from unexpected authenticated accounts. Patch availability and specific remediation guidance should be obtained from vendor security advisories and official patches as they become available.
Priority Score
Share
External POC / Exploit Code
Leaving vuln.today