7.5

CVE-2021-0206: juniper networks junos os NULL Pointer Dereference

CVSS: 7.5v3.1HighModified
Published 15-01-2021Last modified 17-09-2024
Open JSON

Vulnerability summary

CVE-2021-0206 is a high (CVSS 7.5) NULL Pointer Dereference vulnerability in juniper networks junos os. EPSS estimates a 1.33% chance of exploitation in the next 30 days, higher than 70.5% of scored vulnerabilities.

Overall risk
30/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.5/10
010
High · v3.1 (CVE.org)
EPSS score
1.33%
0%100%
Low · +0.02 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 15-01-2021
    PublishedVulnerability first disclosed.
  2. 17-09-2024
    Last modifiedVulnerability information updated.

Description

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.

CVSS metrics

3 scores · 2 sources · 2 versions

EPSS trend

Probability

1.33%

Chance of exploitation in the next 30 days

Percentile

71%

Versus all other CVEs

30-day change

+0.02 pp

From 1.31% on 20-09-2026

20-09-202620-10-2026
EPSS score
1.33%

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
  • junos18.3 | 18.3:r1 | 18.3:r1-s1 | 18.3:r1-s2 | 18.3:r1-s3 | 18.3:r1-s5 | 18.3:r1-s6 | 18.3:r2 | 18.3:r2-s1 | 18.3:r2-s2 | 18.3:r2-s3 | 18.3:r2-s4 | 18.3:r3 | 18.3:r3-s1 | 18.3:r3-s2 | 18.3:r3-s3 | 18.4 | 18.4:r1 | 18.4:r1-s1 | 18.4:r1-s2 | 18.4:r1-s5 | 18.4:r1-s6 | 18.4:r2 | 18.4:r2-s1 | 18.4:r2-s2 | 18.4:r2-s3 | 18.4:r2-s4 | 18.4:r3 | 19.1 | 19.1:r1 | 19.1:r1-s1 | 19.1:r1-s2 | 19.1:r1-s3 | 19.1:r1-s4 | 19.1:r1-s5 | 19.1:r2 | 19.1:r2-s1 | 19.2 | 19.2:r1 | 19.2:r1-s1 | 19.3 | 19.3:r1 | 19.3:r1-s1
Juniper networks1 product
  • junos os≥ 18.3R1, < 18.3* | ≥ 18.4, < 18.4R3-S1 | ≥ 19.1, < 19.1R1-S6, 19.1R2-S2, 19.1R3 | ≥ 19.2, < 19.2R1-S2, 19.2R2 | ≥ 19.3, < 19.3R2

2 vendors · 2 products

References

1 links