CVE-2025-54799

published 2025-08-07

CVE-2025-54799: 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…

Priority P4 13 low 2.3 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

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.

Affected

5 ranges

Vendor	Product	Version range	Fixed in
debian	golang-github-xenolf-lego	—	—
github.com	go-acme_lego	0 – 4.25.1	—
github.com	go-acme_lego_v3	0 – 4.25.1	—
github.com	go-acme_lego_v4	>= 0 < 4.25.2	4.25.2
go-acme	lego	< 4.25.2	4.25.2

CVSS provenance

nvd v4.0 2.3 LOW 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

osv 2.3 LOW

vendor_debian 2.3 LOW

vendor_redhat 2.3 LOW

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CWE-319