Junos OS : Stack overflow vulnerability in CLI command processing

published 2023-10-12 3 y ago modified 2026-06-17 4 mo ago also EUVD-2023-48535

cvss: 5.5; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.2%; EPSS 0.2% chance of exploitation in 30 days, percentile 6%
public exploits: 0; none known

A Stack-based Buffer Overflow vulnerability in the CLI command of Juniper Networks Junos OS allows a low privileged attacker to execute a specific CLI commands leading to Denial of Service.

Repeated actions by the attacker will create a sustained Denial of Service (DoS) condition.

This issue affects Juniper Networks:

Junos OS:

* All versions prior to 20.4R3-S8; * 21.2 versions prior to 21.2R3-S6; * 21.3 versions prior to 21.3R3-S5; * 22.1 versions prior to 22.1R3-S3; * 22.3 versions prior to 22.3R3; * 22.4 versions prior to 22.4R3.

Patch / fix

fixed in 1

Juniper Networks Junos OS 20.4R3-S8, 21.2R3-S6, 21.3R3-S5, 22.1R3-S3, 22.3R3, 22.4R3

CISA SSVC

Exploitation: none
Automatable: no
Technical impact: partial
Assessed: 2 y ago (2024-09-19)

Exploit prediction

0.17% chance of exploitation in the next 30 days, higher than 6% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.1	5.5	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
NVD	3.1	5.5	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected products

Juniper Networks Junos OS

Classification

Weakness

CWE-787 Out-of-bounds Write
CWE-121 Stack-based Buffer Overflow

References

supportportal.juniper.net /JSA73140
vendor-advisory

Sources

CVE List CVE-2023-44176
NVD CVE-2023-44176

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary