CVE-2022-26071Network attack vector

Off-path UDP port discovery via ICMP limits

Published May 5, 2022 · Updated Sep 17, 2024

Improper randomness in the TMM of F5 BIG-IP allows remote attackers to discover open UDP ports through crafted off-path network traffic. TMM limits reply ICMP packets in a way that lets crafted probes distinguish open UDP ports and neutralize UDP source-port randomization. No authentication or on-path position is required; the bounded result is rapid UDP service discovery and reduced resistance to spoofing-based attacks.

CVSS severity7.5
High
EPSS probability1.06%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper randomness in the TMM of F5 BIG-IP allows remote attackers to discover open UDP ports through crafted off-path network traffic. TMM limits reply ICMP packets in a way that lets crafted probes distinguish open UDP ports and neutralize UDP source-port randomization. No authentication or on-path position is required; the bounded result is rapid UDP service discovery and reduced resistance to spoofing-based attacks.

The record

CVE
CVE-2022-26071
Published
May 5, 2022
Updated
Sep 17, 2024
Vendor
F5 Networks
Product
BIG-IP
Classifications
CWE-330, T1046
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 5, 2022CVE publishedPublication date reported by the CVE source.
  2. Sep 17, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=11.6.x
  2. Affected versionversion=12.1.x
  3. Affected versionversion=13.1.x <13.1.5
  4. Affected versionversion=14.1.x <14.1.4.6
  5. Affected versionversion=15.1.x <15.1.5.1
  6. Affected versionversion=16.1.x <16.1.2.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

F5 Networks · BIG-IPversion=11.6.x; version=12.1.x; version=13.1.x <13.1.5; version=14.1.x <14.1.4.6; version=15.1.x <15.1.5.1; version=16.1.x <16.1.2.2

Published CVSS scores

7.4F5CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
7.5NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
5.0NVDAV:N/AC:L/Au:N/C:N/I:P/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.

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

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 exploitUnconfirmed

Weakness, pattern, technique

CWE-330Use of Insufficiently Random Values
T1046Network Service Discovery

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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