7.5

CVE-2021-31353: juniper networks junos os

CVSS: 7.5v3.1HighModified
Published 19-10-2021Last modified 16-09-2024
Open JSON

Vulnerability summary

CVE-2021-31353 is a high (CVSS 7.5) vulnerability in juniper networks junos os. EPSS estimates a 1.17% chance of exploitation in the next 30 days, higher than 66.8% of scored vulnerabilities. 1 public exploit is recorded.

Overall risk
40/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.5/10
010
High · v3.1 (CVE.org)
EPSS score
1.17%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits1reference

Timeline

  1. 19-10-2021
    PublishedVulnerability first disclosed.
  2. 16-09-2024
    Last modifiedVulnerability information updated.

Description

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.

CVSS metrics

3 scores · 2 sources · 2 versions

EPSS trend

Probability

1.17%

Chance of exploitation in the next 30 days

Percentile

67%

Versus all other CVEs

30-day change

0.00 pp

From 1.17% on 19-09-2026

19-09-202619-10-2026
EPSS score
1.17%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

1 found
  • referenceUnverified

    Exploit Reference (kb.juniper.net)

    Maturity: unknown

Weaknesses

CWE · root cause

Affected systems

Juniper2 products
  • junos19.3:r3-s2 | 19.4:r3-s3 | 20.2:r2-s3 | 20.2:r3 | 20.2:r3-s1 | 20.3:r2 | 20.3:r2-s1 | 20.4:r2 | 20.4:r2-s1 | 21.1:r1 | 21.1:r1-s1
  • junos_os_evolved≤ 20.3 | 20.4:r1 | 20.4:r1-s1 | 20.4:r1-s2 | 20.4:r2 | 20.4:r2-s1 | 20.4:r2-s2 | 21.1:r1 | 21.1:r1-s1 | 21.2:r1 | 21.2:r1-s1
Juniper networks2 products
  • junos os19.3R3-S2 | 19.4R3-S3 | ≥ 21.1, < 21.1R2
  • junos os evolved≥ unspecified, < 20.4R2-S3-EVO, 20.4R3-EVO | ≥ 21.1-EVO, < 21.1R2-EVO | ≥ 21.2-EVO, < 21.2R2-EVO

2 vendors · 4 products

References

1 links