CVE-2025-52952
Reported by juniper · Published July 11, 2025
An Out-of-bounds Write vulnerability in the connectivity fault management (CFM) daemon of Juniper Networks Junos OS on MX Series with MPC-BUILTIN, MPC1 through MPC9 line cards allows an unauthenticated adjacent attacker to send a malformed packet to the device, leading to an FPC crash and restart, resulting in a Denial of Service (DoS). Continued receipt and processing of this packet will create a sustained Denial of Service (DoS) condition. This issue affects Juniper Networks: Junos OS: * All versions before 22.2R3-S1, * from 22.4 before 22.4R2. This feature is not enabled by default.
Fixed versions
Upgrade to a fixed version or later. Language registries are listed first, then Linux distributions, then vendor products.
| Package | Ecosystem | Fixed in |
|---|---|---|
| Junos OS | Juniper Networks | 22.4R2, 22.2R3-S1 |
| junos | juniper | 22.2 |
Risk scores
Affected products
| Vendor | Product | Versions |
|---|---|---|
| Juniper Networks | Junos OS | 0, 22.4 |
| Juniper Networks | Junos OS | 0, 22.4 |
Timeline
- Jul 9, 2025 CVE Published
- Jul 11, 2025 Coalition ESS Score (10 in total, the first dated here)
- Jul 12, 2025 EPSS Score (30 in total, the first dated here)
- Jan 26, 2026 CVE Updated
- Jun 2, 2026 Security Advisory
Query this with the API
The same record, from the CLI:
vulnetix vdb vuln CVE-2025-52952
vulnetix vdb fixes CVE-2025-52952Or with curl, using the org id and key from your account page:
curl -s -H "Authorization: ApiKey ${VULNETIX_ORG_ID}:${VULNETIX_API_KEY}" \
"https://api.vdb.vulnetix.com/v2/vuln/CVE-2025-52952/fixes/registry"The Community plan is free and allows 50 queries a day. Get a free API key · API quickstart