What is CVE-2024-30397?

CVE-2024-30397 is a high-severity vulnerability in Juniper Junos, classified under Improper Check for Unusual or Exceptional Conditions. CVSS score: 7.5/10. Published 2024-04-12.

How severe is CVE-2024-30397?

High severity. CVSS v3 base score is 7.5 out of 10.

Is CVE-2024-30397 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Vulnerability in Juniper Junos

CVE-2024-30397

An Improper Check for Unusual or Exceptional Conditions vulnerability in the the Public Key Infrastructure daemon (pkid) of Juniper Networks Junos OS allows an unauthenticated networked attacker to cause Denial of Service (DoS). The pkid is responsible for the certificate verification. Upon a failed verification, the pkid uses all CPU resources and becomes unresponsive to future verification attempts. This means that all subsequent VPN negotiations depending on certificate verification will fail. This CPU utilization of pkid can be checked using this command: root@srx> show system processes extensive | match pkid xxxxx root 103 0 846M 136M CPU1 1 569:00 100.00% pkid This issue affects: Juniper Networks Junos OS * All versions prior to 20.4R3-S10; * 21.2 versions prior to 21.2R3-S7; * 21.4 versions prior to 21.4R3-S5; * 22.1 versions prior to 22.1R3-S4; * 22.2 versions prior to 22.2R3-S3; * 22.3 versions prior to 22.3R3-S1; * 22.4 versions prior to 22.4R3; * 23.2 versions prior to 23.2R1-S2, 23.2R2.

Published 2024-04-12 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.003 (25.3th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 25th percentile — 25.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: -0.000

Affected products

Juniper Junos — versions 20.4, 21.2, 21.4
Juniper Networks Junos OS — versions 0, 21.2, 21.4

Weakness classification (CWE)

CWE-754 — Improper Check for Unusual or Exceptional Conditions

Public proof-of-concept exploits

fkie-cad/nvd-json-data-feeds

References

supportportal.juniper.net/JSA79179 (vendor-advisory, Vendor Advisory)
www.first.org/cvss/calculator/4.0 (technical-description, Issue Tracking)

Frequently asked questions

What is CVE-2024-30397?: CVE-2024-30397 is a high-severity vulnerability in Juniper Junos, classified under Improper Check for Unusual or Exceptional Conditions. CVSS score: 7.5/10. Published 2024-04-12.
How severe is CVE-2024-30397?: High severity. CVSS v3 base score is 7.5 out of 10.
Is CVE-2024-30397 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.