Junos OS: SRX Series and EX Series: Security Vulnerability in J-web allows a preAuth Remote Code Execution

Summary

An Out-of-bounds Write vulnerability in J-Web of Juniper Networks Junos OS on SRX Series and EX Series allows an unauthenticated, network-based attacker to cause a Denial of Service (DoS), or Remote Code Execution (RCE) and obtain root privileges on the device. This issue is caused by use of an insecure function allowing an attacker to overwrite arbitrary memory. This issue affects Juniper Networks Junos OS SRX Series and EX Series: • Junos OS versions earlier than 20.4R3-S9; • Junos OS 21.2 versions earlier than 21.2R3-S7; • Junos OS 21.3 versions earlier than 21.3R3-S5; • Junos OS 21.4 versions earlier than 21.4R3-S5; • Junos OS 22.1 versions earlier than 22.1R3-S4; • Junos OS 22.2 versions earlier than 22.2R3-S3; • Junos OS 22.3 versions earlier than 22.3R3-S2; • Junos OS 22.4 versions earlier than 22.4R2-S2, 22.4R3.

Timeline

1. Jan 12, 2024, 12:52 AM UTCCVE published
2. Oct 25, 2024, 8:22 PM UTCCISA SSVC assessment

   Exploitation: none · Automatable: yes · Technical impact: total

3. Oct 25, 2024, 8:23 PM UTCRecord last updated
4. Oct 28, 2026EPSS reached 10%

   FIRST estimates at least a 10% chance of exploitation in the next 30 days

Affected versions

• Juniper Networks Junos OS

  fixed in 20.4R3-S9; From 21.2 · fixed in 21.2R3-S7; From 21.3 · fixed in 21.3R3-S5; From 21.4 · fixed in 21.4R3-S5; From 22.1 · fixed in 22.1R3-S4; From 22.2 · fixed in 22.2R3-S3; From 22.3 · fixed in 22.3R3-S2

References 3