PT-2024-5596 · Juniper Networks · Junos

Published 2024-07-10 · Updated 2024-07-11 · CVE-2024-39540

Positive Technologies (AI Summary)

CVSS v4.0

8.7

High

Base vector

AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Name of the Vulnerable Software and Affected Versions Junos OS versions 21.2R3-S5 through 21.2R3-S5

Description An Improper Check for Unusual or Exceptional Conditions issue in the Packet Forwarding Engine (pfe) of Juniper Networks Junos OS allows an unauthenticated, network-based attacker to cause a Denial-of-Service (DoS). When an affected device receives specific valid TCP traffic, the pfe crashes and restarts, leading to a momentary but complete service outage.

Recommendations Update to Junos OS 21.2R3-S6 to avoid service outages. As a temporary workaround, consider restricting access to the Packet Forwarding Engine until a patch is applied.

Fix

DoS

Improper Check for Exceptional Conditions

Weakness Enumeration

CWE-754

Related Identifiers

BDU:2024-06282

CVE-2024-39540

Affected Products

Junos

References · 10

• https://supportportal.juniper.net/JSA83000 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2024-39540 · Security Note
• https://safe-surf.ru/upload/VULN-new/VULN.2024-07-19.1.pdf · Security Note
• https://bdu.fstec.ru/vul/2024-06282 · Security Note
• https://osv.dev/vulnerability/CVE-2024-39540 · Vendor Advisory
• https://cybersecurity-help.cz/vdb/SB2024072230 · Note
• https://twitter.com/CVEnew/status/1811440409203134777 · Twitter Post
• https://twitter.com/VulmonFeeds/status/1811475285549760990 · Twitter Post
• https://twitter.com/CveFindCom/status/1811475756976845145 · Twitter Post
• https://t.me/cvedetector/689 · Telegram Post