Improper handling of exceptional conditions in Juniper Junos OS Evolved
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- Low · Low · None
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA.
Summary
A vulnerability in the processing of TCP MD5 authentication in Juniper Networks Junos OS Evolved may allow a BGP or LDP session configured with MD5 authentication to succeed, even if the peer does not have TCP MD5 authentication enabled. This could lead to untrusted or unauthorized sessions being established, resulting in an impact on confidentiality or stability of the network. This issue affects Juniper Networks Junos OS Evolved: All versions prior to 20.3R2-S1-EVO; 20.4 versions prior to 20.4R2-EVO; 21.1 versions prior to 21.1R2-EVO. Juniper Networks Junos OS is not affected by this issue.
Why it matters now
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 Evolved | before 20.3R2-S1-EVO; 20.4 to before 20.4R2-EVO; 21.1 to before 21.1R2-EVO | 20.3R2-S1-EVO, 20.4R2-EVO, 21.1R2-EVO | Patch available | CNA |
- Junos OS Evolved VendorJuniper Affected before 20.3R2-S1-EVO; 20.4 to before 20.4R2-EVO; 21.1 to before 21.1R2-EVO Fixed in 20.3R2-S1-EVO, 20.4R2-EVO, 21.1R2-EVO Patch available CNA
CPE configurations NVD · 5
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:juniper:junos_os_evolved:20.3:r1:*:*:*:*:*:* | 20.3 r1 | Vulnerable | Juniper |
| cpe:2.3:o:juniper:junos_os_evolved:20.3:r1-s1:*:*:*:*:*:* | 20.3 r1-s1 | Vulnerable | Juniper |
| cpe:2.3:o:juniper:junos_os_evolved:20.3:r2:*:*:*:*:*:* | 20.3 r2 | Vulnerable | Juniper |
| cpe:2.3:o:juniper:junos_os_evolved:20.4:r1:*:*:*:*:*:* | 20.4 r1 | Vulnerable | Juniper |
| cpe:2.3:o:juniper:junos_os_evolved:21.1:r1:*:*:*:*:*:* | 21.1 r1 | Vulnerable | Juniper |
- cpe:2.3:o:juniper:junos_os_evolved:20.3:r1:*:*:*:*:*:* Versions 20.3 r1 Vulnerable ·Juniper
- cpe:2.3:o:juniper:junos_os_evolved:20.3:r1-s1:*:*:*:*:*:* Versions 20.3 r1-s1 Vulnerable ·Juniper
- cpe:2.3:o:juniper:junos_os_evolved:20.3:r2:*:*:*:*:*:* Versions 20.3 r2 Vulnerable ·Juniper
- cpe:2.3:o:juniper:junos_os_evolved:20.4:r1:*:*:*:*:*:* Versions 20.4 r1 Vulnerable ·Juniper
- cpe:2.3:o:juniper:junos_os_evolved:21.1:r1:*:*:*:*:*:* Versions 21.1 r1 Vulnerable ·Juniper
Remediation
- Fix · CNA Junos OS Evolved (Juniper Networks) Fixed in 20.3R2-S1-EVO, 20.4R2-EVO, 21.1R2-EVO
Timeline
- 2026-10-02 Threatist record created from CVE-2021-0297
- 2026-10-03 Alias added: GHSA-7wwm-2jv9-972x
References
Advisory 1
More Juniper Junos Os Evolved vulnerabilities
- TI-2026-17602 Junos OS Evolved: PTX Series: A vulnerability allows a unauthenticated, network-based attacker to execute code as root CVSS 4.0CRITICAL 9.3
- TI-2026-17601 Junos OS and Junos OS Evolved: Configuration of a specific SSH option results in mgd crash CVSS 4.0MEDIUM 6.7
- TI-2023-04136 Improper input validation in Juniper Junos OS CVSS 3.1HIGH 7.5
- TI-2026-74215 Stack-based buffer overflow in Junos OS rpd triggered by BGP peers CVSS 4.0CRITICAL 9.3
- TI-2026-74211 Authentication bypass in Juniper J-Web allows pre-auth CGI execution CVSS 4.0CRITICAL 9.3
- TI-2021-00146 Junos OS and Junos OS Evolved: Upon receipt of a specific BGP FlowSpec message network traffic may be disrupted. CVSS 3.1CRITICAL 10.0
Sources
- CVE-2021-0297 · CVE Program
- CVE-2021-0297 · NVD
- FIRST EPSS
- GHSA-7wwm-2jv9-972x · GitHub Advisory Database · CC BY 4.0
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