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.
Published 2021-10-19 19:15:09
Updated 2021-10-25 21:52:15
View at NVD,   CVE.org
Vulnerability category: Execute codeDenial of service

Exploit prediction scoring system (EPSS) score for CVE-2021-31354

0.20%
Probability of exploitation activity in the next 30 days EPSS Score History
~ 57 %
Percentile, the proportion of vulnerabilities that are scored at or less

CVSS scores for CVE-2021-31354

Base Score Base Severity CVSS Vector Exploitability Score Impact Score Score Source First Seen
5.4
MEDIUM AV:A/AC:M/Au:N/C:P/I:P/A:P
5.5
6.4
NIST
8.8
HIGH CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
2.8
5.9
NIST
7.1
HIGH CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L
1.6
5.5
Juniper Networks, Inc.

CWE ids for CVE-2021-31354

  • The product reads data past the end, or before the beginning, of the intended buffer.
    Assigned by:
    • nvd@nist.gov (Primary)
    • sirt@juniper.net (Secondary)

References for CVE-2021-31354

  • https://kb.juniper.net/JSA11219
    2021-10 Security Bulletin: Junos OS and Junos OS Evolved: A vulnerability in the Juniper Agile License Client may allow an attacker to perform Remote Code Execution (RCE) (CVE-2021-31354) - Juniper Ne
    Vendor Advisory

Products affected by CVE-2021-31354

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