Juniper Junos OS: 2025-01 Security Bulletin: Junos OS and Junos OS Evolved: On SRv6 enabled devices, an attacker sending a malformed BGP update can cause the rpd to crash (JSA92861) (CVE-2025-21593)

Juniper Junos OS: 2025-01 Security Bulletin: Junos OS and Junos OS Evolved: On SRv6 enabled devices, an attacker sending a malformed BGP update can cause the rpd to crash (JSA92861) (CVE-2025-21593)

Severity

6

CVSS

(AV:A/AC:L/Au:N/C:N/I:N/A:C)

Published

01/08/2025

Created

01/10/2025

Added

01/09/2025

Modified

01/28/2025

Description

An Improper Control of a Resource Through its Lifetime vulnerability in the routing protocol daemon (rpd) of Juniper Networks Junos OS and Junos OS Evolved allows an unauthenticated network-based attacker to cause a Denial-of-Service (DoS). On devices with SRv6 (Segment Routing over IPv6) enabled, an attacker can send a malformed BGP UPDATE packet which will cause the rpd to crash and restart. Continued receipt of these UPDATE packets will cause a sustained DoS condition.  This issue affects iBGP and eBGP, and both IPv4 and IPv6 are affected by this vulnerability.This issue affects Junos OS:  *All versions before 21.2R3-S9,  *from 21.4 before 21.4R3-S10,  *from 22.2 before 22.2R3-S5,  *from 22.3 before 22.3R3-S4,  *from 22.4 before 22.4R3-S3,  *from 23.2 before 23.2R2-S2,  *from 23.4 before 23.4R2; and Junos OS Evolved:  *All versions before 21.2R3-S9-EVO,  *from 21.4-EVO before 21.4R3-S10-EVO,  *from 22.2-EVO before 22.2R3-S5-EVO,  *from 22.3-EVO before 22.3R3-S4-EVO,  *from 22.4-EVO before 22.4R3-S3-EVO, *from 23.2-EVO before 23.2R2-S2-EVO,  *from 23.4-EVO before 23.4R2-EVO.

Solution(s)

• juniper-junos-os-upgrade-latest

References

• https://attackerkb.com/topics/cve-2025-21593
• CVE - 2025-21593
• JSA92861