CVE-2024-30391Network attack vector

Tunnel traffic manipulation via omitted IPsec authentication

Published Apr 12, 2024 · Updated Aug 9, 2024

Missing IPsec authentication in Juniper Networks Junos OS on MX Series with SPC3 and SRX Series allows remote attackers to alter tunnel traffic. The Packet Forwarding Engine sends no authentication information and accepts inbound encrypted data without checking authentication when HMAC-SHA-384 or HMAC-SHA-512 is configured. An attacker must reach an affected IPsec tunnel; affected peers pass unauthenticated transit traffic, while an unaffected peer causes traffic failure.

CVSS severity6.3
Medium
EPSS probability0.44%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Missing IPsec authentication in Juniper Networks Junos OS on MX Series with SPC3 and SRX Series allows remote attackers to alter tunnel traffic. The Packet Forwarding Engine sends no authentication information and accepts inbound encrypted data without checking authentication when HMAC-SHA-384 or HMAC-SHA-512 is configured. An attacker must reach an affected IPsec tunnel; affected peers pass unauthenticated transit traffic, while an unaffected peer causes traffic failure.

The record

CVE
CVE-2024-30391
Published
Apr 12, 2024
Updated
Aug 9, 2024
Vendor
Juniper Networks
Product
Junos OS
Classifications
CWE-306, T1565.002
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 12, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 9, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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

  1. Affected versionversion=0 <20.4R3-S7
  2. Affected versionversion=21.1 <21.1R3
  3. Affected versionversion=21.2 <21.2R2-S1, 21.2R3
  4. Affected versionversion=21.3 <21.3R1-S2, 21.3R2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Juniper Networks · Junos OSversion=0 <20.4R3-S7; version=21.1 <21.1R3; version=21.2 <21.2R2-S1, 21.2R3; version=21.3 <21.3R1-S2, 21.3R2

Published CVSS scores

4.8Juniper Networks, Inc.CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:L
6.3Juniper Networks, Inc.CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA: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.

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-306Missing Authentication for Critical Function
T1565.002Transmitted Data Manipulation

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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