CVE-2024-39549Network attack vector

Routing denial of service via BGP memory leak

Published Jul 11, 2024 · Updated Feb 26, 2025

Memory exhaustion in Juniper Networks Junos OS and Junos OS Evolved allows remote attackers to interrupt routing via malformed BGP updates. The rpd process allocates memory while logging a bad BGP Path attribute and does not release that allocation in all error-handling paths. Reachability requires a BGP session capable of delivering the crafted update; repeated updates consume memory until rpd is manually restarted.

CVSS severity8.7
High
EPSS probability0.47%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Memory exhaustion in Juniper Networks Junos OS and Junos OS Evolved allows remote attackers to interrupt routing via malformed BGP updates. The rpd process allocates memory while logging a bad BGP Path attribute and does not release that allocation in all error-handling paths. Reachability requires a BGP session capable of delivering the crafted update; repeated updates consume memory until rpd is manually restarted.

The record

CVE
CVE-2024-39549
Published
Jul 11, 2024
Updated
Feb 26, 2025
Vendor
Juniper Networks
Product
Junos OS Evolved
Classifications
CWE-401, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 11, 2024CVE publishedPublication date reported by the CVE source.
  2. Feb 26, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <21.2R3-S8-EVO
  2. Affected versionversion=21.4 <21.4R3-S8-EVO
  3. Affected versionversion=22.2 <22.2R3-S4-EVO
  4. Affected versionversion=22.3 <22.3R3-S3-EVO
  5. Affected versionversion=22.4 <22.4R3-S3-EVO
  6. Affected versionversion=23.2 <23.2R2-S1-EVO
  7. Affected versionversion=23.4 <23.4R1-S2-EVO
  8. Affected versionversion=23.4 <23.4R1-S2-EVO, 23.4R2-EVO
  9. Affected versionversion=23.4 <23.4R2-EVO
  10. Affected versionversion=24.2 <24.2R2-EVO

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Juniper Networks · Junos OS Evolvedversion=0 <21.2R3-S8-EVO; version=21.4 <21.4R3-S8-EVO; version=22.2 <22.2R3-S4-EVO; version=22.3 <22.3R3-S3-EVO; version=22.4 <22.4R3-S3-EVO; version=23.2 <23.2R2-S1-EVO; version=23.4 <23.4R1-S2-EVO; version=23.4 <23.4R1-S2-EVO, 23.4R2-EVO; version=23.4 <23.4R2-EVO; version=24.2 <24.2R2-EVO
Juniper Networks · Junos OSversion=0 <21.2R3-S8; version=21.4 <21.4R3-S8; version=22.2 <22.2R3-S4; version=22.3 <22.3R3-S3; version=22.4 <22.4R3-S3; version=23.2 <23.2R2-S1; version=23.4 <23.4R1-S2; version=23.4 <23.4R1-S2, 23.4R2; version=23.4 <23.4R2; version=24.2 <24.2R2

Published CVSS scores

8.7Juniper NetworksCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L/R:U
7.5Juniper NetworksCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-401Missing Release of Memory after Effective Lifetime
T1499.004Endpoint Denial of Service: Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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