CVE-2025-54799

LOW EPSS 9.9%
Published Aug 7, 202510mo ago · Modified Jun 17, 20261w ago
2.3 CVSS 4.0
Low
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Published Aug 7, 2025 10mo ago
Last Modified Jun 17, 2026 1w ago

Description

Let's Encrypt client and ACME library written in Go (Lego). In versions 4.25.1 and below, the github.com/go-acme/lego/v4/acme/api package (thus the lego library and the lego cli as well) don't enforce HTTPS when talking to CAs as an ACME client. Unlike the http-01 challenge which solves an ACME challenge over unencrypted HTTP, the ACME protocol requires HTTPS when a client communicates with the CA to performs ACME functions. However, the library fails to enforce HTTPS both in the original discover URL (configured by the library user) and in the subsequent addresses returned by the CAs in the directory and order objects. If users input HTTP URLs or CAs misconfigure endpoints, protocol operations occur over HTTP instead of HTTPS. This compromises privacy by exposing request/response details like account and request identifiers to network attackers. This was fixed in version 4.25.2.

CVSS Details

Base Score
2.3
Exploitability
—
Impact
—
Vector string
CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:P/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/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
Attack Vector Network
Attack Complexity High
Privileges Required None
User Interaction P
Scope X

Threat Intelligence

EPSS Exploit Probability
9.9% percentile
Exploit & Patch Status
No Known Exploit
No Patch Available

Weaknesses 1

CWE-319

References 2

  • github.com https://github.com/go-acme/lego/commit/238454b5f74f3cfcbb244ff0d0dc914a4ad44b96
  • github.com https://github.com/go-acme/lego/security/advisories/GHSA-q82r-2j7m-9rv4

Remediation

No remediation data recorded yet

Check vendor advisories and the NVD entry for patch availability.