When AdaCore Ada Web Server 25.0.0 is linked with GnuTLS, the default behaviour of AWS.Client is vulnerable to a man-in-the-middle attack b…

published 2025-02-26 20 mo ago modified 2026-06-17 4 mo ago also EUVD-2025-5281

cvss: 7.4; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.3%; EPSS 0.3% chance of exploitation in 30 days, percentile 21%
public exploits: 0; none known

When AdaCore Ada Web Server 25.0.0 is linked with GnuTLS, the default behaviour of AWS.Client is vulnerable to a man-in-the-middle attack because of lack of verification of an HTTPS server's certificate (unless the using program specifies a TLS configuration).

Patch / fix

distros 1

libaws Debian 11 20.2-2+deb11u1

debian advisories DEBIAN-CVE-2024-55581

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2024-55581 updated 2025-11-21 cvss 7.4

aws: AWS.Client is vulnerable to a man-in-the-middle attack due to lack of verification of an HTTPS server's certificate

Red Hat All currently supported Red Hat products
not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation: Proof of concept is public
Automatable: no
Technical impact: total
Assessed: 20 mo ago (2025-03-04)

Exploit prediction

0.29% chance of exploitation in the next 30 days, higher than 21% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

docs.adacore.com https://docs.adacore.com/corp/security-advisories/SEC.AWS-0056-v1.pdf referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
CISA ADP	3.1	7.4	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
CNA	3.1	7.4	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

Classification

Weakness

CWE-295 Improper Certificate Validation

References

docs.adacore.com /corp/security-advisories/SEC.AWS-0056-v1.pdf
exploit, vendor-advisory
lists.debian.org /debian-lts-announce/2025/03/msg00007.html
mailing-list, third-party-advisory

Sources

CVE List CVE-2024-55581
NVD CVE-2024-55581

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary