CVE-2024-53990Public exploitNetwork attack vector

Cross-user data exposure via cookie jar overwrite

Published Dec 2, 2024 · Updated Dec 4, 2024

Improper authentication in Async Http Client 2.1.0 through 2.12.3 and 3.0.0.Beta1 through 3.0.0 allows remote attackers to use another user's cookie. DefaultAsyncHttpClient.executeRequest and Redirect30xInterceptor feed CookieStore entries to RequestBuilderBase.addOrReplaceCookie, replacing an explicitly set same-name cookie. A shared client must process multiple users and retain a response cookie; a later request with the same cookie name then carries the stored user's authentication material.

CVSS severity9.2
Critical
EPSS probability0.58%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper authentication in Async Http Client 2.1.0 through 2.12.3 and 3.0.0.Beta1 through 3.0.0 allows remote attackers to use another user's cookie. DefaultAsyncHttpClient.executeRequest and Redirect30xInterceptor feed CookieStore entries to RequestBuilderBase.addOrReplaceCookie, replacing an explicitly set same-name cookie. A shared client must process multiple users and retain a response cookie; a later request with the same cookie name then carries the stored user's authentication material.

The record

CVE
CVE-2024-53990
Published
Dec 2, 2024
Updated
Dec 4, 2024
Vendor
AsyncHttpClient
Product
Async Http Client
Classifications
CWE-287, T1550.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 2, 2024CVE publishedPublication date reported by the CVE source.
  2. Dec 4, 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=0 <3.0.1
  2. Affected versionversion=< 3.0.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

AsyncHttpClient · Async Http Clientversion=0 <3.0.1; version=< 3.0.1

Published CVSS scores

9.2GitHub CNACVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA: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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-287Improper Authentication
T1550.004Use Alternate Authentication Material: Web Session Cookie

Public exploit references

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Technologies

Your stack

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Your stack

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