7.1

CVE-2025-21595: juniper networks junos os

CVSS: 7.1v4.0HighAnalyzed
Published 09-04-2025Last modified 10-04-2025
Open JSON

Vulnerability summary

CVE-2025-21595 is a high (CVSS 7.1) vulnerability in juniper networks junos os. EPSS estimates a 0.26% chance of exploitation in the next 30 days, higher than 16.2% of scored vulnerabilities.

Overall risk
28/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.1/10
010
High · v4.0 (CVE.org)
EPSS score
0.26%
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

A Missing Release of Memory after Effective Lifetime vulnerability in the Packet Forwarding Engine (PFE) of Juniper Networks Junos OS and Junos OS Evolved allows an adjacent, unauthenticated attacker to cause an FPC to crash, leading to Denial of Service (DoS). On all Junos OS and Junos OS Evolved platforms, in an EVPN-VXLAN scenario, when specific ARP packets are received on an IPv4 network, or specific NDP packets are received on an IPv6 network, kernel heap memory leaks, which eventually leads to an FPC crash and restart. This issue does not affect MX Series platforms. Heap size growth on FPC can be seen using below command. user@host> show chassis fpc                     Temp CPU Utilization (%) CPU Utilization (%) Memory   Utilization (%) Slot State           (C) Total Interrupt     1min   5min   15min   DRAM (MB)   Heap   Buffer   0 Online           45     3         0       2       2      2       32768      19       0 <<<<<<< Heap increase in all fPCs This issue affects Junos OS: * All versions before 21.2R3-S7, * 21.4 versions before 21.4R3-S4, * 22.2 versions before 22.2R3-S1, * 22.3 versions before 22.3R3-S1, * 22.4 versions before 22.4R2-S2, 22.4R3. and Junos OS Evolved: * All versions before 21.2R3-S7-EVO, * 21.4-EVO versions before 21.4R3-S4-EVO, * 22.2-EVO versions before 22.2R3-S1-EVO, * 22.3-EVO versions before 22.3R3-S1-EVO, * 22.4-EVO versions before 22.4R3-EVO.

CVSS metrics

4 scores · 2 sources · 2 versions

EPSS trend

Probability

0.26%

Chance of exploitation in the next 30 days

Percentile

16%

Versus all other CVEs

30-day change

0.00 pp

From 0.26% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.26%

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< 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 | 21.2:r3-s6 | 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 | 21.4:r3-s4 | 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 | 22.3:r3 | 22.4 | 22.4:r1 | 22.4:r1-s1 | 22.4:r1-s2 | 22.4:r2 | 22.4:r2-s1 | 22.4:r3
  • 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 | 21.2:r3-s6 | 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 | 21.4:r3-s4 | 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 | 22.3:r3 | 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< 21.2R3-S7 | ≥ 21.4, < 21.4R3-S4 | ≥ 22.2, < 22.2R3-S1 | ≥ 22.3, < 22.3R3-S1 | ≥ 22.4, < 22.4R2-S2, 22.4R3
  • junos os evolved< 21.2R3-S7-EVO | ≥ 21.4-EVO, < 21.4R3-S4-EVO | ≥ 22.2-EVO, < 22.2R3-S1-EVO | ≥ 22.3-EVO, < 22.3R3-S1-EVO | ≥ 22.4-EVO, < 22.4R3-EVO

2 vendors · 4 products

References

1 links