CVE-2024-41708Network attack vector

Session hijacking via predictable random values

Published Sep 25, 2024 · Updated Sep 26, 2024

Insufficiently random values in AdaCore Ada Web Server before 25.1 allow remote attackers to hijack sessions by predicting session secrets. Random_String in src/core/aws-utils.adb biases output toward 1 and 2 and uses a non-cryptographic Mersenne Twister for session IDs and private keys. Exploitation requires enough PRNG output to recover its state, after which active sessions can be impersonated.

CVSS severity7.5
High
EPSS probability0.43%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Insufficiently random values in AdaCore Ada Web Server before 25.1 allow remote attackers to hijack sessions by predicting session secrets. Random_String in src/core/aws-utils.adb biases output toward 1 and 2 and uses a non-cryptographic Mersenne Twister for session IDs and private keys. Exploitation requires enough PRNG output to recover its state, after which active sessions can be impersonated.

The record

CVE
CVE-2024-41708
Published
Sep 25, 2024
Updated
Sep 26, 2024
Vendor
AdaCore
Product
Ada Web Server
Classifications
CWE-330, T1550.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 25, 2024CVE publishedPublication date reported by the CVE source.
  2. Sep 26, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=20.00

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

AdaCore · Ada Web Serverversion=20.00

Published CVSS scores

7.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-330Use of Insufficiently Random Values
T1550.004Use Alternate Authentication Material: Web Session Cookie

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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