7.5

CVE-2021-0226: juniper networks junos os evolved Improper Initialization

CVSS: 7.5v3.1HighModified
Published 22-04-2021Last modified 17-09-2024
Open JSON

Vulnerability summary

CVE-2021-0226 is a high (CVSS 7.5) Improper Initialization vulnerability in juniper networks junos os evolved. EPSS estimates a 0.88% chance of exploitation in the next 30 days, higher than 58.2% of scored vulnerabilities.

Overall risk
30/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.5/10
010
High · v3.1 (NVD)
EPSS score
0.88%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 22-04-2021
    PublishedVulnerability first disclosed.
  2. 17-09-2024
    Last modifiedVulnerability information updated.

Description

On Juniper Networks Junos OS Evolved devices, receipt of a specific IPv6 packet may cause an established IPv6 BGP session to terminate, creating a Denial of Service (DoS) condition. Continued receipt and processing of this packet will create a sustained Denial of Service (DoS) condition. This issue does not affect IPv4 BGP sessions. This issue affects IBGP or EBGP peer sessions with IPv6. This issue affects: Juniper Networks Junos OS Evolved: 19.4 versions prior to 19.4R2-S3-EVO; 20.1 versions prior to 20.1R2-S3-EVO; 20.2 versions prior to 20.2R2-S1-EVO; 20.3 versions prior to 20.3R2-EVO. This issue does not affect Juniper Networks Junos OS releases.

CVSS metrics

3 scores · 2 sources · 2 versions

EPSS trend

Probability

0.88%

Chance of exploitation in the next 30 days

Percentile

58%

Versus all other CVEs

30-day change

0.00 pp

From 0.88% on 18-09-2026

18-09-202618-10-2026
EPSS score
0.88%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Juniper1 product
  • junos_os_evolved20.1:r1 | 20.1:r1-s1 | 20.1:r2 | 20.1:r2-s1 | 20.1:r2-s2 | 20.2:r1 | 20.2:r1-s1 | 20.2:r2 | 20.3:r1 | 20.3:r1-s1
Juniper networks1 product
  • junos os evolved≥ 19.4-EVO, < 19.4R2-S3-EVO | ≥ 20.1-EVO, < 20.1R2-S3-EVO | ≥ 20.2-EVO, < 20.2R2-S1-EVO | ≥ 20.3-EVO, < 20.3R2-EVO

2 vendors · 2 products

References

1 links