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CVE-2025-52982VulnerabilityPublished Updated

CVE-2025-52982: Juniper Networks Junos OS · Improper Resource Shutdown or Release

Affects Juniper Networks Junos OSSource CVE Database V5

0

Not known to be exploited · CVSS 5.9 Medium.

Data as of 26 Oct 2026, 06:26 UTC

CVSS 3.1 base score
5.9Medium
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.4% chance of exploitation in 30 days – higher than 38% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 11 Jul 2025

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponised: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 2026-10-26.

What to do

Affected software

ProductAffectedFixed in
Juniper Networks Junos OSAffected
  • =0
  • =21.4
  • =22.2
  • =22.4
Fixed in–

AI-suggested

To mitigate CVE-2025-52982, European organizations should: 1) Identify all Juniper MX Series devices with MS-MPC modules in their network and verify the Junos OS versions in use. 2) Upgrade affected devices to Junos OS versions that include the fix: versions 21.2R3-S9 or later for the 21.2 branch, 21.4 versions after 21.4R1, 22.2 versions from 22.2R3-S6 onwards, and 22.4 versions from 22.4R3-S6 onwards. 3) If immediate upgrade is not feasible, consider disabling SIP ALG functionality or reducing the number of service sets processing SIP calls to one, if operationally acceptable, to avoid triggering the vulnerability. 4) Implement network segmentation and access controls to limit exposure of MX Series devices to untrusted networks, reducing the attack surface. 5) Monitor network traffic for unusual SIP call patterns that could indicate attempts to exploit this vulnerability. 6) Engage with Juniper Networks support for any available patches or workarounds and stay updated on vendor advisories. 7) Conduct regular vulnerability assessments and penetration testing focusing on SIP infrastructure and routing devices to detect potential exploitation attempts.

Description

An Improper Resource Shutdown or Release vulnerability in the SIP ALG of Juniper Networks Junos OS on MX Series with MS-MPC allows an unauthenticated, network-based attacker to cause a Denial-of-Service (DoS). When an MX Series device with an MS-MPC is configured with two or more service sets which are both processing SIP calls, a specific sequence of call events will lead to a crash and restart of the MS-MPC. This issue affects Junos OS: * all versions before 21.2R3-S9, * 21.4 versions from 21.4R1, * 22.2 versions before 22.2R3-S6, * 22.4 versions before 22.4R3-S6. As the MS-MPC is EoL after Junos OS 22.4, later versions are not affected. This issue does not affect MX-SPC3 or SRX Series devices.

References

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