CVE-2026-21905
BaseFortify
Publication date: 2026-01-15
Last updated on: 2026-01-15
Assigner: Juniper Networks, Inc.
Description
Description
CVSS Scores
EPSS Scores
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Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| juniper | junoss | to 21.2r3-s10 (exc) |
| juniper | junoss | to 21.4r3-s12 (exc) |
| juniper | junoss | to 22.4r3-s8 (exc) |
| juniper | junoss | to 23.2r2-s5 (exc) |
| juniper | junoss | to 23.4r2-s6 (exc) |
| juniper | junoss | to 24.2r2-s3 (exc) |
| juniper | junoss | to 24.4r2-s1 (exc) |
| juniper | junoss | to 25.2r1-s1 (exc) |
| juniper | junoss | 25.2r2 |
Helpful Resources
Exploitability
| CWE ID | Description |
|---|---|
| CWE-835 | The product contains an iteration or loop with an exit condition that cannot be reached, i.e., an infinite loop. |
Attack-Flow Graph
AI Powered Q&A
Can you explain this vulnerability to me?
This vulnerability is an infinite loop issue in the SIP application layer gateway (ALG) of Juniper Networks Junos OS on certain SRX and MX Series devices. An unauthenticated attacker can send specific SIP messages over TCP that cause the SIP headers to be parsed incorrectly, triggering a continuous loop. This loop leads to a watchdog timer expiration and crashes critical processes (flowd or mspmand), resulting in a denial of service.
How can this vulnerability impact me? :
The vulnerability can cause a denial of service (DoS) by crashing the flow management process on affected Junos OS devices. This crash disrupts normal network operations, potentially causing service outages or degraded network performance on SRX Series and MX Series devices with the specified service cards.