Riskcovery

CVE-2025-21591

Junos OS: An unauthenticated adjacent attacker sending a malformed DHCP packet causes jdhcpd to crash

State
Published
Severity
7.1 High
Published
Apr 9, 2025
Updated
Apr 28, 2025
Reserved
Dec 26, 2024

Read the record on cve.org

Description

A Buffer Access with Incorrect Length Value vulnerability in the jdhcpd daemon of Juniper Networks Junos OS, when DHCP snooping is enabled, allows an unauthenticated, adjacent, attacker to send a DHCP packet with a malformed DHCP option to cause jdhcp to crash creating a Denial of Service (DoS) condition.

Continuous receipt of these DHCP packets using the malformed DHCP Option will create a sustained Denial of Service (DoS) condition.

This issue affects Junos OS:

* from 23.1 before 23.2R2-S3, * from 23.4 before 23.4R2-S3, * from 24.2 before 24.2R2.

This issue isn't applicable to any versions of Junos OS before 23.1R1.

This issue doesn't affect vSRX Series which doesn't support DHCP Snooping.

This issue doesn't affect Junos OS Evolved.

There are no indicators of compromise for this issue.

Scores

CVSSScoreVectorSource
4.07.1 HighCVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L/AU:Y/R:U/V:C/RE:M/U:Greenjuniper
3.17.4 HighCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:Hjuniper

Weaknesses

  • CWE-805 Buffer Access with Incorrect Length Value

Affected Products

ProductVersions
Junos OSJuniper Networks
  • 23.1 to before 23.2R2-S3Affected
  • 23.4 to before 23.4R2-S3Affected
  • 24.2 to before 24.2R2Affected
  • 23.1R1 and earlierNot affected

References

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