CVE-2025-52494: Adacore Ada Web Server (AWS) before 25.2 is vulnerable to a denial-of-service (DoS) condition due to improper

Q: How do I fix CVE-2025-52494?

ada web server: upgrade to 26.0. Exact commands for each OS are on this page.

Q: Is CVE-2025-52494 being exploited?

CVE-2025-52494 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2025-52494 affect?

CVE-2025-52494 affects ada web server. Severity is high (CVSS 7.5). Adacore Ada Web Server (AWS) before 25.2 is vulnerable to a denial-of-service (DoS) condition due to improper handling of SSL handshakes during connection initialization. When a client initiates an HTTPS connection, the server performs the

Q: How urgent is CVE-2025-52494?

Priority 44/100. High severity; Remotely exploitable, no login, no user action; On your watchlist

This month

HIGH 7.5REMOTEWATCHLISTUPGRADE

CVE-2025-52494 is a high-severity flaw (CVSS 7.5) affecting ada web server. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Adacore Ada Web Server (AWS) before 25.2 is vulnerable to a denial-of-service (DoS) condition due to improper handling of SSL handshakes during connection initialization. When a client initiates an HTTPS connection, the server performs the SSL handshake before assigning the connection to a processing slot. However, there is no specific timeout set for this phase, and the server uses the default socket timeout, which is effectively infinite. An at

Why this priority

High severity
Remotely exploitable, no login, no user action
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.4% (top 71%)
CISA exploited list	No
Weakness	CWE-400, CWE-770
Published	2025-09-03
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: adacore

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2025-09-03 18:15 UTCPublished CVE record published
2026-06-17 09:36 UTCUpdated Record last modified

adacore ada web server UPGRADE

Affected: < 26.0

Fixed in: 26.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy ada-web-server || rpm -q ada-web-server || ada-web-server --version

2. UPGRADE to 26.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade ada-web-server

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade ada-web-server

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2025-52494?

ada web server: upgrade to 26.0. Exact commands for each OS are on this page.

Is CVE-2025-52494 being exploited?

CVE-2025-52494 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2025-52494 affect?

CVE-2025-52494 affects ada web server. Severity is high (CVSS 7.5). Adacore Ada Web Server (AWS) before 25.2 is vulnerable to a denial-of-service (DoS) condition due to improper handling of SSL handshakes during connection initialization. When a client initiates an HTTPS connection, the server performs the

How urgent is CVE-2025-52494?

Priority 44/100. High severity; Remotely exploitable, no login, no user action; On your watchlist

Software pages

AWS vulnerabilities

Related CVEs

CVE-2024-55581 HIGH 7.4 DOWNGRADE MITIGATE When AdaCore Ada Web Server 25.0.0 is linked with GnuTLS, the default behaviour of AWS.Client is vulnerable to

References

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