All vulnerabilities
CVE-2026-102081

Junos OS: SRX4000 Series, SRX5000 Series and MX Series with SPC3: With application services configured, high session churn causes memory leak which will ultimately impact traffic

Juniper Networks Junos OSNetwork & edge
Open in ThreatlineRecord JSON
CVSS
7.5High
ExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.37%Chance of exploitation activity in the next 30 days, higher than 30% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed in23.4R2-S7Also 24.2R2-S3, 24.4R2-S3 and 1 moreCVE List
Published14 Oct 2026Updated 14 Oct 2026CVE List

What fixes it

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

Description

A Missing Release of Memory after Effective Lifetime vulnerability in the packet forwarding engine (PFE) of Juniper Networks Junos OS on SRX Series allows an unauthenticated, network-based attacker to cause a complete Denial-of-Service (DoS).

On SRX4000 Series, and SRX5000 Series with SPC3, and MX Series with SPC3, when one or more specific application services like ALGs, IDP/DPI, APPID, SECINTEL, AAMW or AppQoE are configured, a high connections per second churn will cause PFE memory to leak. If the memory is exhausted traffic processing will be impacted.

Use the CLI command show security monitoring to monitor the memory utilization of the PFEs on the FPCs.

This issue affects Junos OS on SRX Series and MX Series:

  • 23.4 versions from 23.4R2-S3 before 23.4R2-S7;
  • 24.2 versions from 24.2R2 before 24.2R2-S3;
  • 24.4 versions before 24.4R2-S3;
  • 25.2 versions before 25.2R1-S2, 25.2R2.

Text from CVE List

Affected versions 4

  • Junos OSaffected: 23.4R2-S3 before 23.4R2-S7CVE List
  • Junos OSaffected: 24.2R2 before 24.2R2-S3CVE List
  • Junos OSaffected: 24.4 before 24.4R2-S3CVE List
  • Junos OSaffected: 25.2 before 25.2R1-S2, 25.2R2CVE List

References 1