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CVE-2025-21597: juniper networks junos os

CVSS: 6.0v4.0MediumAnalyzed
Published 09-04-2025Last modified 10-04-2025
Open JSON

Vulnerability summary

CVE-2025-21597 is a medium (CVSS 6.0) vulnerability in juniper networks junos os. EPSS estimates a 0.25% chance of exploitation in the next 30 days, higher than 14.9% of scored vulnerabilities.

Overall risk
24/100
0100
Low · default modelHow is this calculated?
CVSS score
6.0/10
010
Medium · v4.0 (CVE.org)
EPSS score
0.25%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 09-04-2025
    PublishedVulnerability first disclosed.
  2. 10-04-2025
    Last modifiedVulnerability information updated.

Description

An Improper Check for Unusual or Exceptional Conditions vulnerability in 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). On all Junos OS and Junos OS Evolved platforms, when BGP rib-sharding and update-threading are configured, and a BGP peer flap is done with specific timing, rpd crashes and restarts. Continuous peer flapping at specific time intervals will result in a sustained Denial of Service (DoS) condition. This issue affects eBGP and iBGP, in both IPv4 and IPv6 implementations. This issue requires a remote attacker to have at least one established BGP session. The issue can occur with or without logical-systems enabled. This issue affects: Junos OS: * All versions before 20.4R3-S8, * 21.2 versions before 21.2R3-S6, * 21.3 versions before 21.3R3-S5, * 21.4 versions before 21.4R3-S4, * 22.1 versions before 22.1R3-S3, * 22.2 versions before 22.2R3-S1, * 22.3 versions before 22.3R3, * 22.4 versions before 22.4R3. Junos OS Evolved: * All versions before 21.2R3-S6-EVO, * 21.3-EVO versions before 21.3R3-S5-EVO, * 21.4-EVO versions before 21.4R3-S4-EVO, * 22.1-EVO versions before 22.1R3-S3-EVO, * 22.2-EVO versions before :22.2R3-S1-EVO, * 22.3-EVO versions before 22.3R3-EVO, * 22.4-EVO versions before 22.4R3-EVO.

CVSS metrics

4 scores · 2 sources · 2 versions

EPSS trend

Probability

0.25%

Chance of exploitation in the next 30 days

Percentile

15%

Versus all other CVEs

30-day change

0.00 pp

From 0.25% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.25%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Juniper2 products
  • junos< 20.4 | 20.4 | 20.4:r1 | 20.4:r1-s1 | 20.4:r2 | 20.4:r2-s1 | 20.4:r2-s2 | 20.4:r3 | 20.4:r3-s1 | 20.4:r3-s2 | 20.4:r3-s3 | 20.4:r3-s4 | 20.4:r3-s5 | 20.4:r3-s6 | 20.4:r3-s7 | 21.2 | 21.2:r1 | 21.2:r1-s1 | 21.2:r1-s2 | 21.2:r2 | 21.2:r2-s1 | 21.2:r2-s2 | 21.2:r3 | 21.2:r3-s1 | 21.2:r3-s2 | 21.2:r3-s3 | 21.2:r3-s4 | 21.2:r3-s5 | 21.3 | 21.3:r1 | 21.3:r1-s1 | 21.3:r1-s2 | 21.3:r2 | 21.3:r2-s1 | 21.3:r2-s2 | 21.3:r3 | 21.3:r3-s1 | 21.3:r3-s2 | 21.3:r3-s3 | 21.3:r3-s4 | 21.4 | 21.4:r1 | 21.4:r1-s1 | 21.4:r1-s2 | 21.4:r2 | 21.4:r2-s1 | 21.4:r2-s2 | 21.4:r3 | 21.4:r3-s1 | 21.4:r3-s2 | 21.4:r3-s3 | 22.1 | 22.1:r1 | 22.1:r1-s1 | 22.1:r1-s2 | 22.1:r2 | 22.1:r2-s1 | 22.1:r2-s2 | 22.1:r3 | 22.1:r3-s1 | 22.1:r3-s2 | 22.2 | 22.2:r1 | 22.2:r1-s1 | 22.2:r1-s2 | 22.2:r2 | 22.2:r2-s1 | 22.2:r2-s2 | 22.2:r3 | 22.3 | 22.3:r1 | 22.3:r1-s1 | 22.3:r1-s2 | 22.3:r2 | 22.3:r2-s1 | 22.3:r2-s2 | 22.4 | 22.4:r1 | 22.4:r1-s1 | 22.4:r1-s2 | 22.4:r2 | 22.4:r2-s1 | 22.4:r2-s2
  • junos_os_evolved< 21.2 | 21.2 | 21.2:r1 | 21.2:r1-s1 | 21.2:r1-s2 | 21.2:r2 | 21.2:r2-s1 | 21.2:r2-s2 | 21.2:r3 | 21.2:r3-s1 | 21.2:r3-s2 | 21.2:r3-s3 | 21.2:r3-s4 | 21.2:r3-s5 | 21.3 | 21.3:r1 | 21.3:r1-s1 | 21.3:r2 | 21.3:r2-s1 | 21.3:r2-s2 | 21.3:r3 | 21.3:r3-s1 | 21.3:r3-s2 | 21.3:r3-s3 | 21.3:r3-s4 | 21.4 | 21.4:r1 | 21.4:r1-s1 | 21.4:r1-s2 | 21.4:r2 | 21.4:r2-s1 | 21.4:r2-s2 | 21.4:r3 | 21.4:r3-s1 | 21.4:r3-s2 | 21.4:r3-s3 | 22.1 | 22.1:r1 | 22.1:r1-s1 | 22.1:r1-s2 | 22.1:r2 | 22.1:r2-s1 | 22.1:r3 | 22.1:r3-s1 | 22.1:r3-s2 | 22.2 | 22.2:r1 | 22.2:r1-s1 | 22.2:r1-s2 | 22.2:r2 | 22.2:r2-s1 | 22.2:r2-s2 | 22.2:r3 | 22.3 | 22.3:r1 | 22.3:r1-s1 | 22.3:r1-s2 | 22.3:r2 | 22.3:r2-s1 | 22.3:r2-s2 | 22.4 | 22.4:r1 | 22.4:r1-s1 | 22.4:r1-s2 | 22.4:r2 | 22.4:r2-s1 | 22.4:r2-s2
Juniper networks2 products
  • junos os< 20.4R3-S8 | ≥ 21.2, < 21.2R3-S6 | ≥ 21.3, < 21.3R3-S5 | ≥ 21.4, < 21.4R3-S4 | ≥ 22.1, < 22.1R3-S3 | ≥ 22.2, < 22.2R3-S1 | ≥ 22.3, < 22.3R3 | ≥ 22.4, < 22.4R3
  • junos os evolved< 21.2R3-S6-EVO | ≥ 21.3-EVO, < 21.3R3-S5-EVO | ≥ 21.4-EVO, < 21.4R3-S4-EVO | ≥ 22.1-EVO, < 22.1R3-S3-EVO | ≥ 22.2-EVO, < 22.2R3-S1-EVO | ≥ 22.3-EVO, < 22.3R3-EVO | ≥ 22.4-EVO, < 22.4R3-EVO

2 vendors · 4 products

References

1 links