CVE-2026-101994
Junos OS and Junos OS Evolved: Malformed MC-LAG ICCP message causes l2ald heap disclosure or crash
Juniper Networks Junos OSNetwork & edge
CVSS
7.1HighExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.28%Chance of exploitation activity in the next 30 days, higher than 19% of CVEs. Scored 23 Oct 2026FIRST EPSS
What fixes it
- 23.2R2-S7.7Junos OSCVE List
- 23.4R2-S8.13Junos OSCVE List
- 24.2R2-S5.5Junos OSCVE List
- 24.4R2-S5Junos OSCVE List
- 25.2R2-S2Junos OSCVE List
- 25.4R1-S3Junos OSCVE List
Show all 16 fixed versions
- 26.2R1-S2Junos OSCVE List
- 23.2R2-S7.7-EVOJunos OS EvolvedCVE List
- 23.4R2-S8.11-EVOJunos OS EvolvedCVE List
- 24.2R2-S5.6-EVOJunos OS EvolvedCVE List
- 24.4R2-S5-EVOJunos OS EvolvedCVE List
- 25.2R2-S2-EVOJunos OS EvolvedCVE List
- 25.4R1-S3-EVOJunos OS EvolvedCVE List
- 26.2R1-S2-EVOJunos OS EvolvedCVE List
- 25.2X100-D35-EVOJunos OS EvolvedCVE List
- 25.4X300-D40-EVOJunos OS EvolvedCVE List
A fixed version on one release line is not the upgrade target for every line. Check your exact version and any vendor backports.
Description
An Improper Handling of Length Parameter Inconsistency vulnerability in the
l2ald
daemon of Juniper Networks Junos OS and Junos OS Evolved allows an attacker who can control or impersonate a configured MC-LAG ICCP peer to disclose process heap memory or cause a denial of service via a malformed ICCP message.
Text from CVE List
Affected versions 17
- Junos OSaffected: all versions before 23.2R2-S7.7CVE List
- Junos OSaffected: 23.4 before 23.4R2-S8.13CVE List
- Junos OSaffected: 24.2 before 24.2R2-S5.5CVE List
- Junos OSaffected: 24.4 before 24.4R2-S5CVE List
- Junos OSaffected: 25.2 before 25.2R2-S2CVE List
- Junos OSaffected: 25.4 before 25.4R1-S3CVE List
- Junos OSaffected: 26.2 before 26.2R1-S2CVE List
- Junos OS Evolvedaffected: all versions before 23.2R2-S7.7-EVOCVE List
- Junos OS Evolvedaffected: 23.4 before 23.4R2-S8.11-EVOCVE List
- Junos OS Evolvedaffected: 24.2 before 24.2R2-S5.6-EVOCVE List
- Junos OS Evolvedaffected: 24.4 before 24.4R2-S5-EVOCVE List
- Junos OS Evolvedaffected: 25.2 before 25.2R2-S2-EVOCVE List
- Junos OS Evolvedaffected: 25.4 before 25.4R1-S3-EVOCVE List
- Junos OS Evolvedaffected: 26.2 before 26.2R1-S2-EVOCVE List
- Junos OS Evolvedaffected: 23.4X100CVE List
- Junos OS Evolvedaffected: 25.2X100 before 25.2X100-D35-EVOCVE List
- Junos OS Evolvedaffected: 25.4X300 before 25.4X300-D40-EVOCVE List