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TI-2021-11497 Aliases CVE-2021-31353GHSA-jpg9-x2w5-xfrh

Junos OS and Junos OS Evolved: RPD core upon receipt of specific BGP update

Priority LOW 35CWE-755Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
None · None · High
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA.

Summary

An Improper Handling of Exceptional Conditions vulnerability in Juniper Networks Junos OS and Junos OS Evolved allows an attacker to inject a specific BGP update, causing the routing protocol daemon (RPD) to crash and restart, leading to a Denial of Service (DoS). Continued receipt and processing of the BGP update will create a sustained Denial of Service (DoS) condition. This issue affects very specific versions of Juniper Networks Junos OS: 19.3R3-S2; 19.4R3-S3; 20.2 versions 20.2R2-S3 and later, prior to 20.2R3-S2; 20.3 versions 20.3R2 and later, prior to 20.3R3; 20.4 versions 20.4R2 and later, prior to 20.4R3; 21.1 versions prior to 21.1R2. Juniper Networks Junos OS 20.1 is not affected by this issue. This issue also affects Juniper Networks Junos OS Evolved: All versions prior to 20.4R2-S3-EVO, 20.4R3-EVO; 21.1-EVO versions prior to 21.1R2-EVO; 21.2-EVO versions prior to 21.2R2-EVO.

Why it matters now

EPSS 0.01167 67th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed Junos OS (Juniper Networks): 20.1R1, 20.2, 20.3 +2Junos OS Evolved (Juniper Networks): 20.4R2-S3-EVO, 20.4R3-EVO, 21.1R2-EVO +1

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
JuniperJunos OS19.3R3-S2; 19.4R3-S3; 21.1 to before 21.1R220.1R1, 20.2, 20.3, 20.4, 21.1R2Patch availableCNA
JuniperJunos OS Evolvedbefore 20.4R2-S3-EVO, 20.4R3-EVO; 21.1-EVO to before 21.1R2-EVO; 21.2-EVO to before 21.2R2-EVO20.4R2-S3-EVO, 20.4R3-EVO, 21.1R2-EVO, 21.2R2-EVOPatch availableCNA
  • Junos OS VendorJuniper Affected 19.3R3-S2; 19.4R3-S3; 21.1 to before 21.1R2 Fixed in 20.1R1, 20.2, 20.3, 20.4, 21.1R2 Patch available CNA
  • Junos OS Evolved VendorJuniper Affected before 20.4R2-S3-EVO, 20.4R3-EVO; 21.1-EVO to before 21.1R2-EVO; 21.2-EVO to before 21.2R2-EVO Fixed in 20.4R2-S3-EVO, 20.4R3-EVO, 21.1R2-EVO, 21.2R2-EVO Patch available CNA

CPE configurations NVD · 22

CPEVersionsRoleVendor
cpe:2.3:o:juniper:junos:19.3:r3-s2:*:*:*:*:*:*19.3 r3-s2VulnerableJuniper
cpe:2.3:o:juniper:junos:19.4:r3-s3:*:*:*:*:*:*19.4 r3-s3VulnerableJuniper
cpe:2.3:o:juniper:junos:20.2:r2-s3:*:*:*:*:*:*20.2 r2-s3VulnerableJuniper
cpe:2.3:o:juniper:junos:20.2:r3:*:*:*:*:*:*20.2 r3VulnerableJuniper
cpe:2.3:o:juniper:junos:20.2:r3-s1:*:*:*:*:*:*20.2 r3-s1VulnerableJuniper
cpe:2.3:o:juniper:junos:20.3:r2:*:*:*:*:*:*20.3 r2VulnerableJuniper
cpe:2.3:o:juniper:junos:20.3:r2-s1:*:*:*:*:*:*20.3 r2-s1VulnerableJuniper
cpe:2.3:o:juniper:junos:20.4:r2:*:*:*:*:*:*20.4 r2VulnerableJuniper
cpe:2.3:o:juniper:junos:20.4:r2-s1:*:*:*:*:*:*20.4 r2-s1VulnerableJuniper
cpe:2.3:o:juniper:junos:21.1:r1:*:*:*:*:*:*21.1 r1VulnerableJuniper
  • cpe:2.3:o:juniper:junos:19.3:r3-s2:*:*:*:*:*:* Versions 19.3 r3-s2 Vulnerable ·Juniper
  • cpe:2.3:o:juniper:junos:19.4:r3-s3:*:*:*:*:*:* Versions 19.4 r3-s3 Vulnerable ·Juniper
  • cpe:2.3:o:juniper:junos:20.2:r2-s3:*:*:*:*:*:* Versions 20.2 r2-s3 Vulnerable ·Juniper
  • cpe:2.3:o:juniper:junos:20.2:r3:*:*:*:*:*:* Versions 20.2 r3 Vulnerable ·Juniper
  • cpe:2.3:o:juniper:junos:20.2:r3-s1:*:*:*:*:*:* Versions 20.2 r3-s1 Vulnerable ·Juniper
  • cpe:2.3:o:juniper:junos:20.3:r2:*:*:*:*:*:* Versions 20.3 r2 Vulnerable ·Juniper
  • cpe:2.3:o:juniper:junos:20.3:r2-s1:*:*:*:*:*:* Versions 20.3 r2-s1 Vulnerable ·Juniper
  • cpe:2.3:o:juniper:junos:20.4:r2:*:*:*:*:*:* Versions 20.4 r2 Vulnerable ·Juniper
  • cpe:2.3:o:juniper:junos:20.4:r2-s1:*:*:*:*:*:* Versions 20.4 r2-s1 Vulnerable ·Juniper
  • cpe:2.3:o:juniper:junos:21.1:r1:*:*:*:*:*:* Versions 21.1 r1 Vulnerable ·Juniper
Show 12 more CPE
CPEVersionsRoleVendor
cpe:2.3:o:juniper:junos:21.1:r1-s1:*:*:*:*:*:*21.1 r1-s1VulnerableJuniper
cpe:2.3:o:juniper:junos_os_evolved:*:*:*:*:*:*:*:*up to 20.3VulnerableJuniper
cpe:2.3:o:juniper:junos_os_evolved:20.4:r1:*:*:*:*:*:*20.4 r1VulnerableJuniper
cpe:2.3:o:juniper:junos_os_evolved:20.4:r1-s1:*:*:*:*:*:*20.4 r1-s1VulnerableJuniper
cpe:2.3:o:juniper:junos_os_evolved:20.4:r1-s2:*:*:*:*:*:*20.4 r1-s2VulnerableJuniper
cpe:2.3:o:juniper:junos_os_evolved:20.4:r2:*:*:*:*:*:*20.4 r2VulnerableJuniper
cpe:2.3:o:juniper:junos_os_evolved:20.4:r2-s1:*:*:*:*:*:*20.4 r2-s1VulnerableJuniper
cpe:2.3:o:juniper:junos_os_evolved:20.4:r2-s2:*:*:*:*:*:*20.4 r2-s2VulnerableJuniper
cpe:2.3:o:juniper:junos_os_evolved:21.1:r1:*:*:*:*:*:*21.1 r1VulnerableJuniper
cpe:2.3:o:juniper:junos_os_evolved:21.1:r1-s1:*:*:*:*:*:*21.1 r1-s1VulnerableJuniper
cpe:2.3:o:juniper:junos_os_evolved:21.2:r1:*:*:*:*:*:*21.2 r1VulnerableJuniper
cpe:2.3:o:juniper:junos_os_evolved:21.2:r1-s1:*:*:*:*:*:*21.2 r1-s1VulnerableJuniper
  • cpe:2.3:o:juniper:junos:21.1:r1-s1:*:*:*:*:*:* Versions 21.1 r1-s1 Vulnerable ·Juniper
  • cpe:2.3:o:juniper:junos_os_evolved:*:*:*:*:*:*:*:* Versions up to 20.3 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:20.4:r1-s1:*:*:*:*:*:* Versions 20.4 r1-s1 Vulnerable ·Juniper
  • cpe:2.3:o:juniper:junos_os_evolved:20.4:r1-s2:*:*:*:*:*:* Versions 20.4 r1-s2 Vulnerable ·Juniper
  • cpe:2.3:o:juniper:junos_os_evolved:20.4:r2:*:*:*:*:*:* Versions 20.4 r2 Vulnerable ·Juniper
  • cpe:2.3:o:juniper:junos_os_evolved:20.4:r2-s1:*:*:*:*:*:* Versions 20.4 r2-s1 Vulnerable ·Juniper
  • cpe:2.3:o:juniper:junos_os_evolved:20.4:r2-s2:*:*:*:*:*:* Versions 20.4 r2-s2 Vulnerable ·Juniper
  • cpe:2.3:o:juniper:junos_os_evolved:21.1:r1:*:*:*:*:*:* Versions 21.1 r1 Vulnerable ·Juniper
  • cpe:2.3:o:juniper:junos_os_evolved:21.1:r1-s1:*:*:*:*:*:* Versions 21.1 r1-s1 Vulnerable ·Juniper
  • cpe:2.3:o:juniper:junos_os_evolved:21.2:r1:*:*:*:*:*:* Versions 21.2 r1 Vulnerable ·Juniper
  • cpe:2.3:o:juniper:junos_os_evolved:21.2:r1-s1:*:*:*:*:*:* Versions 21.2 r1-s1 Vulnerable ·Juniper

Remediation

  • Fix · CNA Junos OS (Juniper Networks) Fixed in 20.1R1, 20.2, 20.3, 20.4, 21.1R2
  • Fix · CNA Junos OS Evolved (Juniper Networks) Fixed in 20.4R2-S3-EVO, 20.4R3-EVO, 21.1R2-EVO, 21.2R2-EVO

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-31353
  2. 2026-10-03 Alias added: GHSA-jpg9-x2w5-xfrh

References

Exploit 1

  • 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
See all 792 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences