Junos OS: SRX 300 Series: Specific link local traffic causes a control plane overload
Priority LOW 31CWE-668Published · Updated
Key facts
- Attack vector
- Adjacent network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Attack requirements
- None
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- Fixed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-668 and the CVSS impact.
Summary
An Exposure of Resource to Wrong Sphere vulnerability in the Packet Forwarding Engine (PFE) of Juniper Networks Junos OS on SRX 300 Series allows an unauthenticated, adjacent attacker to cause a Denial of Service (DoS). Specific valid link-local traffic is not blocked on ports in STP blocked state but is instead sent to the control plane of the device. This leads to excessive resource consumption and in turn severe impact on all control and management protocols of the device. This issue affects Juniper Networks Junos OS: * 21.2 version 21.2R3-S3 and later versions earlier than 21.2R3-S6; * 22.1 version 22.1R3 and later versions earlier than 22.1R3-S4; * 22.2 version 22.2R2 and later versions earlier than 22.2R3-S2; * 22.3 version 22.3R2 and later versions earlier than 22.3R3-S1; * 22.4 versions earlier than 22.4R2-S2, 22.4R3; * 23.2 versions earlier than 23.2R1-S1, 23.2R2. This issue does not affect Juniper Networks Junos OS 21.4R1 and later versions of 21.4.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00295 22nd percentileScored 2026-11-07
Fix Fixed Junos OS (Juniper Networks): 21.2R3-S6, 22.1R3-S4, 22.2R3-S2 +6
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Juniper | Junos OS | 21.2R3-S3 to before 21.2R3-S6; 22.1R3 to before 22.1R3-S4; 22.2R2 to before 22.2R3-S2; 22.3R2 to before 22.3R3-S1; 22.4 to before 22.4R2-S2, 22.4R3; 23.2 to before 23.2R1-S1, 23.2R2 | 21.2R3-S6, 22.1R3-S4, 22.2R3-S2, 22.3R3-S1, 22.4R2-S2, 22.4R3, 23.2R1-S1, 23.2R2, 21.4 | Patch available | CNA |
- Junos OS VendorJuniper Affected 21.2R3-S3 to before 21.2R3-S6; 22.1R3 to before 22.1R3-S4; 22.2R2 to before 22.2R3-S2; 22.3R2 to before 22.3R3-S1; 22.4 to before 22.4R2-S2, 22.4R3; 23.2 to before 23.2R1-S1, 23.2R2 Fixed in 21.2R3-S6, 22.1R3-S4, 22.2R3-S2, 22.3R3-S1, 22.4R2-S2, 22.4R3, 23.2R1-S1, 23.2R2, 21.4 Patch available CNA
CPE configurations NVD · 29
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:juniper:junos:21.2:r3-s3:*:*:*:*:*:* | 21.2 r3-s3 | Vulnerable | Juniper |
| cpe:2.3:o:juniper:junos:21.2:r3-s4:*:*:*:*:*:* | 21.2 r3-s4 | Vulnerable | Juniper |
| cpe:2.3:o:juniper:junos:21.2:r3-s5:*:*:*:*:*:* | 21.2 r3-s5 | Vulnerable | Juniper |
| cpe:2.3:o:juniper:junos:22.1:r3:*:*:*:*:*:* | 22.1 r3 | Vulnerable | Juniper |
| cpe:2.3:o:juniper:junos:22.1:r3-s1:*:*:*:*:*:* | 22.1 r3-s1 | Vulnerable | Juniper |
| cpe:2.3:o:juniper:junos:22.1:r3-s2:*:*:*:*:*:* | 22.1 r3-s2 | Vulnerable | Juniper |
| cpe:2.3:o:juniper:junos:22.1:r3-s3:*:*:*:*:*:* | 22.1 r3-s3 | Vulnerable | Juniper |
| cpe:2.3:o:juniper:junos:22.2:r2:*:*:*:*:*:* | 22.2 r2 | Vulnerable | Juniper |
| cpe:2.3:o:juniper:junos:22.2:r2-s1:*:*:*:*:*:* | 22.2 r2-s1 | Vulnerable | Juniper |
| cpe:2.3:o:juniper:junos:22.2:r2-s2:*:*:*:*:*:* | 22.2 r2-s2 | Vulnerable | Juniper |
- cpe:2.3:o:juniper:junos:21.2:r3-s3:*:*:*:*:*:* Versions 21.2 r3-s3 Vulnerable ·Juniper
- cpe:2.3:o:juniper:junos:21.2:r3-s4:*:*:*:*:*:* Versions 21.2 r3-s4 Vulnerable ·Juniper
- cpe:2.3:o:juniper:junos:21.2:r3-s5:*:*:*:*:*:* Versions 21.2 r3-s5 Vulnerable ·Juniper
- cpe:2.3:o:juniper:junos:22.1:r3:*:*:*:*:*:* Versions 22.1 r3 Vulnerable ·Juniper
- cpe:2.3:o:juniper:junos:22.1:r3-s1:*:*:*:*:*:* Versions 22.1 r3-s1 Vulnerable ·Juniper
- cpe:2.3:o:juniper:junos:22.1:r3-s2:*:*:*:*:*:* Versions 22.1 r3-s2 Vulnerable ·Juniper
- cpe:2.3:o:juniper:junos:22.1:r3-s3:*:*:*:*:*:* Versions 22.1 r3-s3 Vulnerable ·Juniper
- cpe:2.3:o:juniper:junos:22.2:r2:*:*:*:*:*:* Versions 22.2 r2 Vulnerable ·Juniper
- cpe:2.3:o:juniper:junos:22.2:r2-s1:*:*:*:*:*:* Versions 22.2 r2-s1 Vulnerable ·Juniper
- cpe:2.3:o:juniper:junos:22.2:r2-s2:*:*:*:*:*:* Versions 22.2 r2-s2 Vulnerable ·Juniper
Show 19 more CPE
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:juniper:junos:22.2:r3:*:*:*:*:*:* | 22.2 r3 | Vulnerable | Juniper |
| cpe:2.3:o:juniper:junos:22.2:r3-s1:*:*:*:*:*:* | 22.2 r3-s1 | Vulnerable | Juniper |
| cpe:2.3:o:juniper:junos:22.3:r2:*:*:*:*:*:* | 22.3 r2 | Vulnerable | Juniper |
| cpe:2.3:o:juniper:junos:22.3:r2-s1:*:*:*:*:*:* | 22.3 r2-s1 | Vulnerable | Juniper |
| cpe:2.3:o:juniper:junos:22.3:r2-s2:*:*:*:*:*:* | 22.3 r2-s2 | Vulnerable | Juniper |
| cpe:2.3:o:juniper:junos:22.3:r3:*:*:*:*:*:* | 22.3 r3 | Vulnerable | Juniper |
| cpe:2.3:o:juniper:junos:22.4:-:*:*:*:*:*:* | 22.4 | Vulnerable | Juniper |
| cpe:2.3:o:juniper:junos:22.4:r1:*:*:*:*:*:* | 22.4 r1 | Vulnerable | Juniper |
| cpe:2.3:o:juniper:junos:22.4:r1-s1:*:*:*:*:*:* | 22.4 r1-s1 | Vulnerable | Juniper |
| cpe:2.3:o:juniper:junos:22.4:r1-s2:*:*:*:*:*:* | 22.4 r1-s2 | Vulnerable | Juniper |
| cpe:2.3:o:juniper:junos:22.4:r2:*:*:*:*:*:* | 22.4 r2 | Vulnerable | Juniper |
| cpe:2.3:o:juniper:junos:22.4:r2-s1:*:*:*:*:*:* | 22.4 r2-s1 | Vulnerable | Juniper |
| cpe:2.3:o:juniper:junos:23.2:-:*:*:*:*:*:* | 23.2 | Vulnerable | Juniper |
| cpe:2.3:o:juniper:junos:23.2:r1:*:*:*:*:*:* | 23.2 r1 | Vulnerable | Juniper |
| cpe:2.3:h:juniper:srx300:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Juniper |
| cpe:2.3:h:juniper:srx320:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Juniper |
| cpe:2.3:h:juniper:srx340:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Juniper |
| cpe:2.3:h:juniper:srx345:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Juniper |
| cpe:2.3:h:juniper:srx380:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Juniper |
- cpe:2.3:o:juniper:junos:22.2:r3:*:*:*:*:*:* Versions 22.2 r3 Vulnerable ·Juniper
- cpe:2.3:o:juniper:junos:22.2:r3-s1:*:*:*:*:*:* Versions 22.2 r3-s1 Vulnerable ·Juniper
- cpe:2.3:o:juniper:junos:22.3:r2:*:*:*:*:*:* Versions 22.3 r2 Vulnerable ·Juniper
- cpe:2.3:o:juniper:junos:22.3:r2-s1:*:*:*:*:*:* Versions 22.3 r2-s1 Vulnerable ·Juniper
- cpe:2.3:o:juniper:junos:22.3:r2-s2:*:*:*:*:*:* Versions 22.3 r2-s2 Vulnerable ·Juniper
- cpe:2.3:o:juniper:junos:22.3:r3:*:*:*:*:*:* Versions 22.3 r3 Vulnerable ·Juniper
- cpe:2.3:o:juniper:junos:22.4:-:*:*:*:*:*:* Versions 22.4 Vulnerable ·Juniper
- cpe:2.3:o:juniper:junos:22.4:r1:*:*:*:*:*:* Versions 22.4 r1 Vulnerable ·Juniper
- cpe:2.3:o:juniper:junos:22.4:r1-s1:*:*:*:*:*:* Versions 22.4 r1-s1 Vulnerable ·Juniper
- cpe:2.3:o:juniper:junos:22.4:r1-s2:*:*:*:*:*:* Versions 22.4 r1-s2 Vulnerable ·Juniper
- cpe:2.3:o:juniper:junos:22.4:r2:*:*:*:*:*:* Versions 22.4 r2 Vulnerable ·Juniper
- cpe:2.3:o:juniper:junos:22.4:r2-s1:*:*:*:*:*:* Versions 22.4 r2-s1 Vulnerable ·Juniper
- cpe:2.3:o:juniper:junos:23.2:-:*:*:*:*:*:* Versions 23.2 Vulnerable ·Juniper
- cpe:2.3:o:juniper:junos:23.2:r1:*:*:*:*:*:* Versions 23.2 r1 Vulnerable ·Juniper
- cpe:2.3:h:juniper:srx300:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Juniper
- cpe:2.3:h:juniper:srx320:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Juniper
- cpe:2.3:h:juniper:srx340:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Juniper
- cpe:2.3:h:juniper:srx345:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Juniper
- cpe:2.3:h:juniper:srx380:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Juniper
Remediation
- Fix · CNA Junos OS (Juniper Networks) Fixed in 21.2R3-S6, 22.1R3-S4, 22.2R3-S2, 22.3R3-S1, 22.4R2-S2, 22.4R3, 23.2R1-S1, 23.2R2, 21.4
Timeline
- 2026-10-02 Threatist record created from CVE-2024-21605
- 2026-10-03 Alias added: GHSA-24g5-r7q6-hhmg
References
More Juniper Junos vulnerabilities
- TI-2023-18638 Junos OS: EX and SRX Series: A PHP vulnerability in J-Web allows an unauthenticated to… KEVCVSS 3.1CRITICAL 9.8
- TI-2020-01585 Out of Cycle Security Advisory: Junos OS: Security vulnerability in J-Web and web based (HTTP/HTTPS) services KEVCVSS 3.1CRITICAL 9.8
- TI-2015-04610 Assertion failure in ISC BIND named via TKEY queries KEVCVSS 3.1HIGH 7.5
- TI-2025-15550 Junos OS: An local attacker with shell access can execute arbitrary code KEVCVSS 4.0MEDIUM 6.7
- TI-2023-18644 Junos OS: SRX Series: A vulnerability in J-Web allows an unauthenticated attacker to upload and download arbitrary files KEVCVSS 3.1MEDIUM 5.3
- TI-2023-18640 Junos OS: EX Series: A vulnerability in J-Web allows an unauthenticated attacker to upload arbitrary files KEVCVSS 3.1MEDIUM 5.3
Sources
- CVE-2024-21605 · CVE Program
- CVE-2024-21605 · NVD
- FIRST EPSS
- GHSA-24g5-r7q6-hhmg · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences