CVE-2024-39809Network attack vector

Session hijacking via unexpired refresh token

Published Aug 14, 2024 · Updated Aug 22, 2024

Insufficient session expiration in F5 BIG-IP Next Central Manager 20.1.0 through 20.1.x allows remote attackers to hijack sessions. The logout path leaves the Central Manager user-session refresh token valid instead of revoking or expiring it. An attacker must obtain a user's session cookie before logout; reuse preserves unauthorized control-plane access to Central Manager and managed systems without affecting data-plane operations.

CVSS severity8.9
High
EPSS probability0.44%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Insufficient session expiration in F5 BIG-IP Next Central Manager 20.1.0 through 20.1.x allows remote attackers to hijack sessions. The logout path leaves the Central Manager user-session refresh token valid instead of revoking or expiring it. An attacker must obtain a user's session cookie before logout; reuse preserves unauthorized control-plane access to Central Manager and managed systems without affecting data-plane operations.

The record

CVE
CVE-2024-39809
Published
Aug 14, 2024
Updated
Aug 22, 2024
Vendor
F5 Networks
Product
BIG-IP Next Central Manager
Classifications
CWE-613, T1550.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 14, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 22, 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=20.1.0 <20.2.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

F5 Networks · BIG-IP Next Central Managerversion=20.1.0 <20.2.0

Published CVSS scores

8.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
7.5F5 NetworksCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
8.9F5 NetworksCVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:A/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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-613Insufficient Session Expiration
T1550.004Use Alternate Authentication Material: Web Session Cookie

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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