8.8

CVE-2021-31354: juniper networks junos os Out-of-bounds Read

CVSS: 8.8v3.1HighModified
Published 19-10-2021Last modified 17-09-2024
Open JSON

Vulnerability summary

CVE-2021-31354 is a high (CVSS 8.8) Out-of-bounds Read vulnerability in juniper networks junos os. EPSS estimates a 0.63% chance of exploitation in the next 30 days, higher than 49.2% of scored vulnerabilities.

Overall risk
35/100
0100
Medium · default modelHow is this calculated?
CVSS score
8.8/10
010
High · v3.1 (NVD)
EPSS score
0.63%
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. 19-10-2021
    PublishedVulnerability first disclosed.
  2. 17-09-2024
    Last modifiedVulnerability information updated.

Description

An Out Of Bounds (OOB) access vulnerability in the handling of responses by a Juniper Agile License (JAL) Client in Juniper Networks Junos OS and Junos OS Evolved, configured in Network Mode (to use Juniper Agile License Manager) may allow an attacker to cause a partial Denial of Service (DoS), or lead to remote code execution (RCE). The vulnerability exists in the packet parsing logic on the client that processes the response from the server using a custom protocol. An attacker with control of a JAL License Manager, or with access to the local broadcast domain, may be able to spoof a new JAL License Manager and/or craft a response to the Junos OS License Client, leading to exploitation of this vulnerability. This issue only affects Junos systems configured in Network Mode. Systems that are configured in Standalone Mode (the default mode of operation for all systems) are not vulnerable to this issue. This issue affects: Juniper Networks Junos OS: 19.2 versions prior to 19.2R3-S3; 19.3 versions prior to 19.3R3-S3; 20.1 versions prior to 20.1R2-S2, 20.1R3-S1; 20.2 versions prior to 20.2R3-S2; 20.3 versions prior to 20.3R3; 20.4 versions prior to 20.4R3; 21.1 versions prior to 21.1R2. Juniper Networks Junos OS Evolved: version 20.1R1-EVO and later versions, prior to 21.2R2-EVO. This issue does not affect Juniper Networks Junos OS versions prior to 19.2R1.

CVSS metrics

3 scores · 2 sources · 2 versions

EPSS trend

Probability

0.63%

Chance of exploitation in the next 30 days

Percentile

49%

Versus all other CVEs

30-day change

0.00 pp

From 0.63% on 20-09-2026

20-09-202620-10-2026
EPSS score
0.63%

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

Juniper2 products
  • junos19.2 | 19.2:r1 | 19.2:r1-s1 | 19.2:r1-s2 | 19.2:r1-s3 | 19.2:r1-s4 | 19.2:r1-s5 | 19.2:r1-s6 | 19.2:r2 | 19.2:r2-s1 | 19.2:r3 | 19.2:r3-s1 | 19.2:r3-s2 | 19.3 | 19.3:r1 | 19.3:r1-s1 | 19.3:r2 | 19.3:r2-s1 | 19.3:r2-s2 | 19.3:r2-s3 | 19.3:r2-s4 | 19.3:r2-s5 | 19.3:r3 | 19.3:r3-s1 | 19.3:r3-s2 | 20.1:r1 | 20.1:r1-s1 | 20.1:r1-s2 | 20.1:r1-s3 | 20.1:r1-s4 | 20.1:r2 | 20.1:r2-s1 | 20.1:r3 | 20.2:r1 | 20.2:r1-s1 | 20.2:r1-s2 | 20.2:r1-s3 | 20.2:r2 | 20.2:r2-s1 | 20.2:r2-s2 | 20.2:r2-s3 | 20.2:r3 | 20.2:r3-s1 | 20.3:r1 | 20.3:r1-s1 | 20.3:r2 | 20.3:r2-s1 | 20.4:r1 | 20.4:r1-s1 | 20.4:r2 | 20.4:r2-s1 | 21.1:r1 | 21.1:r1-s1
  • junos_os_evolved20.1:r1 | 20.1:r1-s1 | 20.1:r2 | 20.1:r2-s1 | 20.1:r2-s2 | 20.1:r2-s3 | 20.1:r2-s4 | 20.1:r2-s5 | 20.1:r3 | 20.2 | 20.2:r1 | 20.2:r1-s1 | 20.2:r2 | 20.2:r2-s1 | 20.2:r3 | 20.3 | 20.3:r1 | 20.3:r1-s1 | 20.3:r1-s2 | 20.3:r1-s3 | 20.3:r2 | 20.4:r1 | 20.4:r1-s1 | 20.4:r1-s2 | 20.4:r2 | 20.4:r2-s1 | 20.4:r2-s2 | 20.4:r2-s3 | 20.4:r3 | 20.4:r3-s1 | 21.1 | 21.1:r1 | 21.1:r1-s1 | 21.1:r2 | 21.2:r1 | 21.2:r1-s1
Juniper networks2 products
  • junos os≥ 19.2, < 19.2R3-S3 | ≥ 19.3, < 19.3R3-S3 | ≥ 20.1, < 20.1R2-S2, 20.1R3-S1 | ≥ 20.2, < 20.2R3-S2 | ≥ 20.3, < 20.3R3 | ≥ 20.4, < 20.4R3 | ≥ 21.1, < 21.1R2
  • junos os evolved≥ 20.1R1-EVO, < unspecified | ≥ unspecified, < 21.2R2-EVO

2 vendors · 4 products

References

1 links