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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.

PUBLISHED Reserved 2024-12-26 | Published 2025-04-09 | Updated 2025-04-28 | Assigner juniper




HIGH: 7.4CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H

HIGH: 7.1CVSS: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:Green

Problem types

CWE-805: Buffer Access with Incorrect Length Value

Product status

Default status
unaffected

23.1 (semver) before 23.2R2-S3
affected

23.4 (semver) before 23.4R2-S3
affected

24.2 (semver) before 24.2R2
affected

Any version
unaffected

Timeline

2025-04-09:Initial Publication

References

supportportal.juniper.net/JSA96448 vendor-advisory

cve.org (CVE-2025-21591)

nvd.nist.gov (CVE-2025-21591)

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