PT-2025-15850 · Juniper Networks · Junos+1

Published 2025-04-09 · Updated 2025-04-09 · CVE-2025-21597

Positive Technologies (AI Summary)

CVSS v4.0

6.0

Medium

Base vector

AV:A/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:A/V:X/RE:X/U:X

Name of the Vulnerable Software and Affected Versions: Junos OS versions prior to 20.4R3-S8 Junos OS versions 21.2 prior to 21.2R3-S6 Junos OS versions 21.3 prior to 21.3R3-S5 Junos OS versions 21.4 prior to 21.4R3-S4 Junos OS versions 22.1 prior to 22.1R3-S3 Junos OS versions 22.2 prior to 22.2R3-S1 Junos OS versions 22.3 prior to 22.3R3 Junos OS versions 22.4 prior to 22.4R3 Junos OS Evolved versions prior to 21.2R3-S6-EVO Junos OS Evolved versions 21.3-EVO prior to 21.3R3-S5-EVO Junos OS Evolved versions 21.4-EVO prior to 21.4R3-S4-EVO Junos OS Evolved versions 22.1-EVO prior to 22.1R3-S3-EVO Junos OS Evolved versions 22.2-EVO prior to 22.2R3-S1-EVO Junos OS Evolved versions 22.3-EVO prior to 22.3R3-EVO Junos OS Evolved versions 22.4-EVO prior to 22.4R3-EVO

Description: An Improper Check for Unusual or Exceptional Conditions vulnerability in the routing protocol daemon (rpd) of Juniper Networks Junos OS and Junos OS Evolved allows an unauthenticated, logically adjacent BGP peer to cause Denial of Service (DoS). This issue affects eBGP and iBGP, in both IPv4 and IPv6 implementations, and requires a remote attacker to have at least one established BGP session. The issue can occur with or without logical-systems enabled. Continuous peer flapping at specific time intervals will result in a sustained Denial of Service (DoS) condition.

Recommendations: For Junos OS versions prior to 20.4R3-S8, update to version 20.4R3-S8 or later. For Junos OS versions 21.2 prior to 21.2R3-S6, update to version 21.2R3-S6 or later. For Junos OS versions 21.3 prior to 21.3R3-S5, update to version 21.3R3-S5 or later. For Junos OS versions 21.4 prior to 21.4R3-S4, update to version 21.4R3-S4 or later. For Junos OS versions 22.1 prior to 22.1R3-S3, update to version 22.1R3-S3 or later. For Junos OS versions 22.2 prior to 22.2R3-S1, update to version 22.2R3-S1 or later. For Junos OS versions 22.3 prior to 22.3R3, update to version 22.3R3 or later. For Junos OS versions 22.4 prior to 22.4R3, update to version 22.4R3 or later. For Junos OS Evolved versions prior to 21.2R3-S6-EVO, update to version 21.2R3-S6-EVO or later. For Junos OS Evolved versions 21.3-EVO prior to 21.3R3-S5-EVO, update to version 21.3R3-S5-EVO or later. For Junos OS Evolved versions 21.4-EVO prior to 21.4R3-S4-EVO, update to version 21.4R3-S4-EVO or later. For Junos OS Evolved versions 22.1-EVO prior to 22.1R3-S3-EVO, update to version 22.1R3-S3-EVO or later. For Junos OS Evolved versions 22.2-EVO prior to 22.2R3-S1-EVO, update to version 22.2R3-S1-EVO or later. For Junos OS Evolved versions 22.3-EVO prior to 22.3R3-EVO, update to version 22.3R3-EVO or later. For Junos OS Evolved versions 22.4-EVO prior to 22.4R3-EVO, update to version 22.4R3-EVO or later.

Fix

DoS

Improper Check for Exceptional Conditions

Weakness Enumeration

CWE-754

Related Identifiers

BDU:2025-04787

CVE-2025-21597

Affected Products

Junos

Junos Evolved

References · 7

• https://kb.juniper.net/JSA96451 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2025-21597 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2025-21597 · Security Note
• https://bdu.fstec.ru/vul/2025-04787 · Security Note
• https://twitter.com/CVEnew/status/1910073383569518811 · Twitter Post
• https://t.me/cvedetector/22604 · Telegram Post
• https://t.me/cvetracker/21249 · Telegram Post