CVE-2025-52982Network attack vector

Service-card restart via mishandled SIP call sequence

Published Jul 11, 2025 · Updated Jul 15, 2025

Improper resource release in Junos OS SIP ALG allows remote attackers to crash and restart an MS-MPC through crafted SIP call events. Juniper has not disclosed which SIP ALG resource remains allocated or which call-state transition fails to release it. The condition requires an MX Series device with an MS-MPC and at least two service sets processing SIP calls; the resulting interruption is an MS-MPC restart.

CVSS severity8.2
High
EPSS probability0.38%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper resource release in Junos OS SIP ALG allows remote attackers to crash and restart an MS-MPC through crafted SIP call events. Juniper has not disclosed which SIP ALG resource remains allocated or which call-state transition fails to release it. The condition requires an MX Series device with an MS-MPC and at least two service sets processing SIP calls; the resulting interruption is an MS-MPC restart.

The record

CVE
CVE-2025-52982
Published
Jul 11, 2025
Updated
Jul 15, 2025
Vendor
Juniper Networks
Product
Junos OS
Classifications
CWE-404, T1498
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 11, 2025CVE publishedPublication date reported by the CVE source.
  2. Jul 15, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <21.2R3-S9
  2. Affected versionversion=21.4 <21.4*
  3. Affected versionversion=22.2 <22.2R3-S6
  4. Affected versionversion=22.4 <22.4R3-S6

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Juniper Networks · Junos OSversion=0 <21.2R3-S9; version=21.4 <21.4*; version=22.2 <22.2R3-S6; version=22.4 <22.4R3-S6

Published CVSS scores

5.9Juniper Networks, Inc.CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
8.2Juniper Networks, Inc.CVSS:4.0/AV:N/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:Y/R:A/V:X/RE:M/U:X

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-404Improper Resource Shutdown or Release
T1498Network Denial of Service

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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