CVE-2025-55247CWE-59

CVE-2025-55247

High · published October 14, 2025

CVSS v3.1
7.3
EPSS
1%
Percentile
48.5
In the wild
Unconfirmed
What it is

⚡ Local privilege escalation is on the menu! An authorized attacker can exploit improper link resolution in .NET to elevate their access like a sneaky guest slipping into the VIP area at a concert. 🎤 Think of it like a restaurant where the waiter mistakenly gives a regular patron access to the exclusive kitchen just because they know the head chef. This vulnerability allows someone with some existing access to push their way into privileged areas they shouldn't be in. If an attacker successfully exploits this flaw, they could gain elevated privileges, allowing them to execute arbitrary commands or access sensitive files—like a backstage pass that lets them roam free through the entire venue. This could lead to data theft, unauthorized system changes, or even a full system compromise, which could be absolutely devastating!

Put simply

Think of it like a restaurant where the waiter mistakenly gives a regular patron access to the exclusive kitchen just because they know the head chef. This vulnerability allows someone with some existing access to push their way into privileged areas they shouldn't be in. This vulnerability arises from improper link resolution before file access, allowing an authorized user to follow symbolic links to files they normally shouldn't access, effectively bypassing security controls.

What to do

If an attacker successfully exploits this flaw, they could gain elevated privileges, allowing them to execute arbitrary commands or access sensitive files—like a backstage pass that lets them roam free through the entire venue. This could lead to data theft, unauthorized system changes, or even a full system compromise, which could be absolutely devastating! To mitigate this risk, ensure that the .NET framework is updated to the latest version where this vulnerability is patched. Implement strict access controls to limit who can initiate link following and regularly audit file permissions to ensure they align with your security policies. You've got this! With a few updates and adjustments, you can keep your system secure and robust. 🛡️

The record
Technical detail
CVSS v3.1
7.3 · HIGH
Vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.00608 · 48.5th percentile
Weakness
CWE-59 · Improper Link Resolution Before File Access ('Link Following')
Published
2025-10-14T21:15Z
Affected products (2)
ProductVersionsFixed in
microsoft/.net≥ 8.0.0, < 8.0.218.0.21
microsoft/.net≥ 9.0.0, < 9.0.109.0.10
References (1)
EPSS history
Timeline
  • 14 OCT 17:00Z
    .NET Elevation of Privilege Vulnerability
    cvelistv5