Junos OS: MX Series and SRX Series: The flow processing daemon (flowd) will crash when specific H.323 packets are received

Summary

An Out-of-Bounds Write vulnerability in the H.323 ALG of Juniper Networks Junos OS allows an unauthenticated, network-based attacker to cause Denial of Service (DoS). On all MX Series and SRX Series platform, when H.323 ALG is enabled and specific H.323 packets are received simultaneously, a flow processing daemon (flowd) crash will occur. Continued receipt of these specific packets will cause a sustained Denial of Service (DoS) condition. This issue affects: Juniper Networks Junos OS on MX Series and SRX Series All versions prior to 19.4R3-S10; 20.2 versions prior to 20.2R3-S6; 20.3 versions prior to 20.3R3-S6; 20.4 versions prior to 20.4R3-S5; 21.1 versions prior to 21.1R3-S4; 21.2 versions prior to 21.2R3-S3; 21.3 versions prior to 21.3R3-S3; 21.4 versions prior to 21.4R3; 22.1 versions prior to 22.1R2-S1, 22.1R3; 22.2 versions prior to 22.2R1-S2, 22.2R2.

Timeline

1. Jan 12, 2023, 12:00 AM UTCCVE published
2. Apr 7, 2025, 7:54 PM UTCCISA SSVC assessment

   Exploitation: none · Automatable: no · Technical impact: total

3. Apr 7, 2025, 7:54 PM UTCRecord last updated

Affected versions

• Juniper Networks Junos OS

  fixed in 19.4R3-S10; From 20.2 · fixed in 20.2R3-S6; From 20.3 · fixed in 20.3R3-S6; From 20.4 · fixed in 20.4R3-S5; From 21.1 · fixed in 21.1R3-S4; From 21.2 · fixed in 21.2R3-S3; From 21.3 · fixed in 21.3R3-S3; From 21.4 · fixed in 21.4R3

References 1