CVE-2024-39534

Traffic-filter bypass via invalid local-address acceptance

Published Oct 11, 2024 · Updated Oct 11, 2024

Incorrect comparison in affected Junos OS Evolved releases allows remote attackers to bypass traffic filters from adjacent networks. The local address verification API accepts an interface subnet's network and broadcast addresses as valid local destinations, so the device creates sessions or accepts traffic addressed to them. Exploitation requires unauthenticated access from an adjacent network and can circumvent stateless firewall filters without causing a reported availability impact.

CVSS severity5.3
Medium
EPSS probability0.66%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Incorrect comparison in affected Junos OS Evolved releases allows remote attackers to bypass traffic filters from adjacent networks. The local address verification API accepts an interface subnet's network and broadcast addresses as valid local destinations, so the device creates sessions or accepts traffic addressed to them. Exploitation requires unauthenticated access from an adjacent network and can circumvent stateless firewall filters without causing a reported availability impact.

The record

CVE
CVE-2024-39534
Published
Oct 11, 2024
Updated
Oct 11, 2024
Vendor
Juniper Networks
Product
Junos OS Evolved
Classifications
CWE-697
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 11, 2024CVE publishedPublication date reported by the CVE source.
  2. Oct 11, 2024Record 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 <21.4R3-S8-EVO
  2. Affected versionversion=22.2-EVO <22.2R3-S4-EVO
  3. Affected versionversion=22.3-EVO <22.3R3-S4-EVO
  4. Affected versionversion=22.4-EVO <22.4R3-S3-EVO
  5. Affected versionversion=23.2-EVO <23.2R2-S1-EVO
  6. Affected versionversion=23.4-EVO <23.4R1-S2-EVO, 23.4R2-EVO

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

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

Published CVSS scores

5.3Juniper NetworksCVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N
5.4Juniper NetworksCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

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.

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No observations available

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

Weakness, pattern, technique

CWE-697Incorrect Comparison

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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