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CVE-2023-36847

Juniper Junos OS EX Series Missing Authentication for Critical Function Vulnerability

Juniper Junos OSNetwork & edge
Open in ThreatlineRecord JSON
CVSS
5.3Medium
ExploitationExploited in the wildAdded to KEV 13 Nov 2023CISA KEV
Exploit odds (EPSS)83.5%Chance of exploitation activity in the next 30 days, higher than 99% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed in20.4R3-S8Also 21.1*, 21.2R3-S6 and 6 moreCVE List
Federal deadline17 Nov 2023Remediation due date for US federal agenciesCISA KEV
CISA required actionApply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable. CISA KEV

What fixes it

Show all 9 fixed versions

A fixed version on one release line is not the upgrade target for every line. Check your exact version and any vendor backports.

Timeline

  1. 17 Aug 2023, 19:16 UTCPublishedCVE List
  2. 13 Nov 2023Added to CISA KEVCISA KEV

Description

Juniper Junos OS on EX Series contains a missing authentication for critical function vulnerability that allows an unauthenticated, network-based attacker to cause limited impact to the file system integrity. With a specific request to installAppPackage.php that doesn't require authentication, an attacker is able to upload arbitrary files via J-Web, leading to a loss of integrity for a certain part of the file system, which may allow chaining to other vulnerabilities.

Text from CVE List

Affected versions 9

  • Junos OSaffected: all versions before 20.4R3-S8CVE List
  • Junos OSaffected: 21.1 before 21.1*CVE List
  • Junos OSaffected: 21.2 before 21.2R3-S6CVE List
  • Junos OSaffected: 21.3 before 21.3R3-S5CVE List
  • Junos OSaffected: 21.4 before 21.4R3-S4CVE List
  • Junos OSaffected: 22.1 before 22.1R3-S3CVE List
  • Junos OSaffected: 22.2 before 22.2R3-S1CVE List
  • Junos OSaffected: 22.3 before 22.3R2-S2, 22.3R3CVE List
  • Junos OSaffected: 22.4 before 22.4R2-S1, 22.4R3CVE List

References 4