RCE as root in Juniper Junos authd via SNMP affects network infrastructure used broadly by enterprises and carriers; can disrupt connectivity and operations.
CVE-2026-101979
Buffer overflow in Junos authd via SNMP enables root RCE or DoS.
Is CVE-2026-101979 being exploited?
Not confirmed. CVE-2026-101979 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.45% probability of exploitation in the next 30 days.
How severe is CVE-2026-101979?
CVE-2026-101979 is rated High with a CVSS score of 8.7. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-101979?
Yes. A fix has been recorded for CVE-2026-101979. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-101979 affect?
CVE-2026-101979 affects Juniper Junos OS, Junos OS Evolved, authd component, Devices with SNMP and AAA enabled. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-101979?
Install Juniper patch immediately; restrict/disable SNMP and tighten AAA until patched.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Remote code execution as root or denial-of-service via crafted SNMP packet when SNMP and AAA are enabled.
Immediate action required
- affected< 23.2R2-S7.7
- affected>= 23.4 and < 23.4R2-S8.13
- affected>= 24.2 and < 24.2R2-S5.5
- affected>= 24.4 and < 24.4R2-S5
- affected>= 25.2 and < 25.2R2-S2
- affected>= 25.4 and < 25.4R1-S3
- affected>= 26.2 and < 26.2R1-S2
- affected< 23.2R2-S7.7-EVO
- affected>= 23.4 and < 23.4R2-S8.11-EVO
- affected>= 24.2 and < 24.2R2-S5.6-EVO
- affected>= 24.4 and < 24.4R2-S5-EVO
- affected>= 25.2 and < 25.2R2-S2-EVO
- affected>= 25.4 and < 25.4R1-S3-EVO
- affected>= 26.2 and < 26.2R1-S2-EVO
- affected23.4X100
- affected>= 25.2X100 and < 25.2X100-D35-EVO
- affected>= 25.4X300 and < 25.4X300-D40-EVO
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.