Junos OS: NFX Series, SRX Series: PFE may crash upon receipt of specific packet when SSL Proxy is configured.
Priority LOW 36CWE-476Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-476.
Summary
A NULL Pointer Dereference vulnerability in Juniper Networks Junos OS allows an attacker to send a specific packet causing the packet forwarding engine (PFE) to crash and restart, resulting in a Denial of Service (DoS). By continuously sending these specific packets, an attacker can repeatedly disable the PFE causing a sustained Denial of Service (DoS). This issue only affects Juniper Networks NFX Series, SRX Series platforms when SSL Proxy is configured. This issue affects Juniper Networks Junos OS on NFX Series and SRX Series: 18.3 versions prior to 18.3R3-S4; 18.4 versions prior to 18.4R3-S1; 19.1 versions prior to 19.1R1-S6, 19.1R2-S2, 19.1R3; 19.2 versions prior to 19.2R1-S2, 19.2R2; 19.3 versions prior to 19.3R2. This issue does not affect Juniper Networks Junos OS versions on NFX Series and SRX Series prior to 18.3R1.
Why it matters now
EPSS 0.01326 71st percentileScored 2026-11-07
Fix Fixed Junos OS (Juniper Networks): 18.4R3-S1, 19.1R1-S6, 19.1R2-S2 +4
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Juniper | Junos OS | 18.3R1 and later; 18.4 to before 18.4R3-S1; 19.1 to before 19.1R1-S6, 19.1R2-S2, 19.1R3; 19.2 to before 19.2R1-S2, 19.2R2; 19.3 to before 19.3R2 | 18.4R3-S1, 19.1R1-S6, 19.1R2-S2, 19.1R3, 19.2R1-S2, 19.2R2, 19.3R2 | Patch available | CNA |
- Junos OS VendorJuniper Affected 18.3R1 and later; 18.4 to before 18.4R3-S1; 19.1 to before 19.1R1-S6, 19.1R2-S2, 19.1R3; 19.2 to before 19.2R1-S2, 19.2R2; 19.3 to before 19.3R2 Fixed in 18.4R3-S1, 19.1R1-S6, 19.1R2-S2, 19.1R3, 19.2R1-S2, 19.2R2, 19.3R2 Patch available CNA
CPE configurations NVD · 59
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:juniper:junos:18.3:-:*:*:*:*:*:* | 18.3 | Vulnerable | Juniper |
| cpe:2.3:o:juniper:junos:18.3:r1:*:*:*:*:*:* | 18.3 r1 | Vulnerable | Juniper |
| cpe:2.3:o:juniper:junos:18.3:r1-s1:*:*:*:*:*:* | 18.3 r1-s1 | Vulnerable | Juniper |
| cpe:2.3:o:juniper:junos:18.3:r1-s2:*:*:*:*:*:* | 18.3 r1-s2 | Vulnerable | Juniper |
| cpe:2.3:o:juniper:junos:18.3:r1-s3:*:*:*:*:*:* | 18.3 r1-s3 | Vulnerable | Juniper |
| cpe:2.3:o:juniper:junos:18.3:r1-s5:*:*:*:*:*:* | 18.3 r1-s5 | Vulnerable | Juniper |
| cpe:2.3:o:juniper:junos:18.3:r1-s6:*:*:*:*:*:* | 18.3 r1-s6 | Vulnerable | Juniper |
| cpe:2.3:o:juniper:junos:18.3:r2:*:*:*:*:*:* | 18.3 r2 | Vulnerable | Juniper |
| cpe:2.3:o:juniper:junos:18.3:r2-s1:*:*:*:*:*:* | 18.3 r2-s1 | Vulnerable | Juniper |
| cpe:2.3:o:juniper:junos:18.3:r2-s2:*:*:*:*:*:* | 18.3 r2-s2 | Vulnerable | Juniper |
- cpe:2.3:o:juniper:junos:18.3:-:*:*:*:*:*:* Versions 18.3 Vulnerable ·Juniper
- cpe:2.3:o:juniper:junos:18.3:r1:*:*:*:*:*:* Versions 18.3 r1 Vulnerable ·Juniper
- cpe:2.3:o:juniper:junos:18.3:r1-s1:*:*:*:*:*:* Versions 18.3 r1-s1 Vulnerable ·Juniper
- cpe:2.3:o:juniper:junos:18.3:r1-s2:*:*:*:*:*:* Versions 18.3 r1-s2 Vulnerable ·Juniper
- cpe:2.3:o:juniper:junos:18.3:r1-s3:*:*:*:*:*:* Versions 18.3 r1-s3 Vulnerable ·Juniper
- cpe:2.3:o:juniper:junos:18.3:r1-s5:*:*:*:*:*:* Versions 18.3 r1-s5 Vulnerable ·Juniper
- cpe:2.3:o:juniper:junos:18.3:r1-s6:*:*:*:*:*:* Versions 18.3 r1-s6 Vulnerable ·Juniper
- cpe:2.3:o:juniper:junos:18.3:r2:*:*:*:*:*:* Versions 18.3 r2 Vulnerable ·Juniper
- cpe:2.3:o:juniper:junos:18.3:r2-s1:*:*:*:*:*:* Versions 18.3 r2-s1 Vulnerable ·Juniper
- cpe:2.3:o:juniper:junos:18.3:r2-s2:*:*:*:*:*:* Versions 18.3 r2-s2 Vulnerable ·Juniper
Show 49 more CPE
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:juniper:junos:18.3:r2-s3:*:*:*:*:*:* | 18.3 r2-s3 | Vulnerable | Juniper |
| cpe:2.3:o:juniper:junos:18.3:r2-s4:*:*:*:*:*:* | 18.3 r2-s4 | Vulnerable | Juniper |
| cpe:2.3:o:juniper:junos:18.3:r3:*:*:*:*:*:* | 18.3 r3 | Vulnerable | Juniper |
| cpe:2.3:o:juniper:junos:18.3:r3-s1:*:*:*:*:*:* | 18.3 r3-s1 | Vulnerable | Juniper |
| cpe:2.3:o:juniper:junos:18.3:r3-s2:*:*:*:*:*:* | 18.3 r3-s2 | Vulnerable | Juniper |
| cpe:2.3:o:juniper:junos:18.3:r3-s3:*:*:*:*:*:* | 18.3 r3-s3 | Vulnerable | Juniper |
| cpe:2.3:o:juniper:junos:18.4:-:*:*:*:*:*:* | 18.4 | Vulnerable | Juniper |
| cpe:2.3:o:juniper:junos:18.4:r1:*:*:*:*:*:* | 18.4 r1 | Vulnerable | Juniper |
| cpe:2.3:o:juniper:junos:18.4:r1-s1:*:*:*:*:*:* | 18.4 r1-s1 | Vulnerable | Juniper |
| cpe:2.3:o:juniper:junos:18.4:r1-s2:*:*:*:*:*:* | 18.4 r1-s2 | Vulnerable | Juniper |
| cpe:2.3:o:juniper:junos:18.4:r1-s5:*:*:*:*:*:* | 18.4 r1-s5 | Vulnerable | Juniper |
| cpe:2.3:o:juniper:junos:18.4:r1-s6:*:*:*:*:*:* | 18.4 r1-s6 | Vulnerable | Juniper |
| cpe:2.3:o:juniper:junos:18.4:r2:*:*:*:*:*:* | 18.4 r2 | Vulnerable | Juniper |
| cpe:2.3:o:juniper:junos:18.4:r2-s1:*:*:*:*:*:* | 18.4 r2-s1 | Vulnerable | Juniper |
| cpe:2.3:o:juniper:junos:18.4:r2-s2:*:*:*:*:*:* | 18.4 r2-s2 | Vulnerable | Juniper |
| cpe:2.3:o:juniper:junos:18.4:r2-s3:*:*:*:*:*:* | 18.4 r2-s3 | Vulnerable | Juniper |
| cpe:2.3:o:juniper:junos:18.4:r2-s4:*:*:*:*:*:* | 18.4 r2-s4 | Vulnerable | Juniper |
| cpe:2.3:o:juniper:junos:18.4:r3:*:*:*:*:*:* | 18.4 r3 | Vulnerable | Juniper |
| cpe:2.3:o:juniper:junos:19.1:-:*:*:*:*:*:* | 19.1 | Vulnerable | Juniper |
| cpe:2.3:o:juniper:junos:19.1:r1:*:*:*:*:*:* | 19.1 r1 | Vulnerable | Juniper |
| cpe:2.3:o:juniper:junos:19.1:r1-s1:*:*:*:*:*:* | 19.1 r1-s1 | Vulnerable | Juniper |
| cpe:2.3:o:juniper:junos:19.1:r1-s2:*:*:*:*:*:* | 19.1 r1-s2 | Vulnerable | Juniper |
| cpe:2.3:o:juniper:junos:19.1:r1-s3:*:*:*:*:*:* | 19.1 r1-s3 | Vulnerable | Juniper |
| cpe:2.3:o:juniper:junos:19.1:r1-s4:*:*:*:*:*:* | 19.1 r1-s4 | Vulnerable | Juniper |
| cpe:2.3:o:juniper:junos:19.1:r1-s5:*:*:*:*:*:* | 19.1 r1-s5 | Vulnerable | Juniper |
| cpe:2.3:o:juniper:junos:19.1:r2:*:*:*:*:*:* | 19.1 r2 | Vulnerable | Juniper |
| cpe:2.3:o:juniper:junos:19.1:r2-s1:*:*:*:*:*:* | 19.1 r2-s1 | Vulnerable | Juniper |
| cpe:2.3:o:juniper:junos:19.2:-:*:*:*:*:*:* | 19.2 | Vulnerable | Juniper |
| cpe:2.3:o:juniper:junos:19.2:r1:*:*:*:*:*:* | 19.2 r1 | Vulnerable | Juniper |
| cpe:2.3:o:juniper:junos:19.2:r1-s1:*:*:*:*:*:* | 19.2 r1-s1 | Vulnerable | Juniper |
| cpe:2.3:o:juniper:junos:19.3:-:*:*:*:*:*:* | 19.3 | Vulnerable | Juniper |
| cpe:2.3:o:juniper:junos:19.3:r1:*:*:*:*:*:* | 19.3 r1 | Vulnerable | Juniper |
| cpe:2.3:o:juniper:junos:19.3:r1-s1:*:*:*:*:*:* | 19.3 r1-s1 | Vulnerable | Juniper |
| cpe:2.3:h:juniper:nfx150:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Juniper |
| cpe:2.3:h:juniper:nfx250:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Juniper |
| cpe:2.3:h:juniper:nfx350:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Juniper |
| cpe:2.3:h:juniper:srx1500:-:*:*:*:*:*:*:* | not specified by NVD | Running on | 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:h:juniper:srx4100:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Juniper |
| cpe:2.3:h:juniper:srx4200:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Juniper |
| cpe:2.3:h:juniper:srx4600:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Juniper |
| cpe:2.3:h:juniper:srx5400:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Juniper |
| cpe:2.3:h:juniper:srx550:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Juniper |
| cpe:2.3:h:juniper:srx5600:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Juniper |
| cpe:2.3:h:juniper:srx5800:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Juniper |
- cpe:2.3:o:juniper:junos:18.3:r2-s3:*:*:*:*:*:* Versions 18.3 r2-s3 Vulnerable ·Juniper
- cpe:2.3:o:juniper:junos:18.3:r2-s4:*:*:*:*:*:* Versions 18.3 r2-s4 Vulnerable ·Juniper
- cpe:2.3:o:juniper:junos:18.3:r3:*:*:*:*:*:* Versions 18.3 r3 Vulnerable ·Juniper
- cpe:2.3:o:juniper:junos:18.3:r3-s1:*:*:*:*:*:* Versions 18.3 r3-s1 Vulnerable ·Juniper
- cpe:2.3:o:juniper:junos:18.3:r3-s2:*:*:*:*:*:* Versions 18.3 r3-s2 Vulnerable ·Juniper
- cpe:2.3:o:juniper:junos:18.3:r3-s3:*:*:*:*:*:* Versions 18.3 r3-s3 Vulnerable ·Juniper
- cpe:2.3:o:juniper:junos:18.4:-:*:*:*:*:*:* Versions 18.4 Vulnerable ·Juniper
- cpe:2.3:o:juniper:junos:18.4:r1:*:*:*:*:*:* Versions 18.4 r1 Vulnerable ·Juniper
- cpe:2.3:o:juniper:junos:18.4:r1-s1:*:*:*:*:*:* Versions 18.4 r1-s1 Vulnerable ·Juniper
- cpe:2.3:o:juniper:junos:18.4:r1-s2:*:*:*:*:*:* Versions 18.4 r1-s2 Vulnerable ·Juniper
- cpe:2.3:o:juniper:junos:18.4:r1-s5:*:*:*:*:*:* Versions 18.4 r1-s5 Vulnerable ·Juniper
- cpe:2.3:o:juniper:junos:18.4:r1-s6:*:*:*:*:*:* Versions 18.4 r1-s6 Vulnerable ·Juniper
- cpe:2.3:o:juniper:junos:18.4:r2:*:*:*:*:*:* Versions 18.4 r2 Vulnerable ·Juniper
- cpe:2.3:o:juniper:junos:18.4:r2-s1:*:*:*:*:*:* Versions 18.4 r2-s1 Vulnerable ·Juniper
- cpe:2.3:o:juniper:junos:18.4:r2-s2:*:*:*:*:*:* Versions 18.4 r2-s2 Vulnerable ·Juniper
- cpe:2.3:o:juniper:junos:18.4:r2-s3:*:*:*:*:*:* Versions 18.4 r2-s3 Vulnerable ·Juniper
- cpe:2.3:o:juniper:junos:18.4:r2-s4:*:*:*:*:*:* Versions 18.4 r2-s4 Vulnerable ·Juniper
- cpe:2.3:o:juniper:junos:18.4:r3:*:*:*:*:*:* Versions 18.4 r3 Vulnerable ·Juniper
- cpe:2.3:o:juniper:junos:19.1:-:*:*:*:*:*:* Versions 19.1 Vulnerable ·Juniper
- cpe:2.3:o:juniper:junos:19.1:r1:*:*:*:*:*:* Versions 19.1 r1 Vulnerable ·Juniper
- cpe:2.3:o:juniper:junos:19.1:r1-s1:*:*:*:*:*:* Versions 19.1 r1-s1 Vulnerable ·Juniper
- cpe:2.3:o:juniper:junos:19.1:r1-s2:*:*:*:*:*:* Versions 19.1 r1-s2 Vulnerable ·Juniper
- cpe:2.3:o:juniper:junos:19.1:r1-s3:*:*:*:*:*:* Versions 19.1 r1-s3 Vulnerable ·Juniper
- cpe:2.3:o:juniper:junos:19.1:r1-s4:*:*:*:*:*:* Versions 19.1 r1-s4 Vulnerable ·Juniper
- cpe:2.3:o:juniper:junos:19.1:r1-s5:*:*:*:*:*:* Versions 19.1 r1-s5 Vulnerable ·Juniper
- cpe:2.3:o:juniper:junos:19.1:r2:*:*:*:*:*:* Versions 19.1 r2 Vulnerable ·Juniper
- cpe:2.3:o:juniper:junos:19.1:r2-s1:*:*:*:*:*:* Versions 19.1 r2-s1 Vulnerable ·Juniper
- cpe:2.3:o:juniper:junos:19.2:-:*:*:*:*:*:* Versions 19.2 Vulnerable ·Juniper
- cpe:2.3:o:juniper:junos:19.2:r1:*:*:*:*:*:* Versions 19.2 r1 Vulnerable ·Juniper
- cpe:2.3:o:juniper:junos:19.2:r1-s1:*:*:*:*:*:* Versions 19.2 r1-s1 Vulnerable ·Juniper
- cpe:2.3:o:juniper:junos:19.3:-:*:*:*:*:*:* Versions 19.3 Vulnerable ·Juniper
- cpe:2.3:o:juniper:junos:19.3:r1:*:*:*:*:*:* Versions 19.3 r1 Vulnerable ·Juniper
- cpe:2.3:o:juniper:junos:19.3:r1-s1:*:*:*:*:*:* Versions 19.3 r1-s1 Vulnerable ·Juniper
- cpe:2.3:h:juniper:nfx150:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Juniper
- cpe:2.3:h:juniper:nfx250:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Juniper
- cpe:2.3:h:juniper:nfx350:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Juniper
- cpe:2.3:h:juniper:srx1500:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·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
- cpe:2.3:h:juniper:srx4100:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Juniper
- cpe:2.3:h:juniper:srx4200:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Juniper
- cpe:2.3:h:juniper:srx4600:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Juniper
- cpe:2.3:h:juniper:srx5400:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Juniper
- cpe:2.3:h:juniper:srx550:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Juniper
- cpe:2.3:h:juniper:srx5600:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Juniper
- cpe:2.3:h:juniper:srx5800:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Juniper
Remediation
- Fix · CNA Junos OS (Juniper Networks) Fixed in 18.4R3-S1, 19.1R1-S6, 19.1R2-S2, 19.1R3, 19.2R1-S2, 19.2R2, 19.3R2
Timeline
- 2026-10-02 Threatist record created from CVE-2021-0206
- 2026-10-03 Alias added: GHSA-9jxc-x8cc-f2vm
References
Advisory 1
More Juniper Junos vulnerabilities
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- 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-2021-0206 · CVE Program
- CVE-2021-0206 · NVD
- FIRST EPSS
- GHSA-9jxc-x8cc-f2vm · 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