CVE-2023-30570Public exploitNetwork attack vector

Daemon crash via responder SPI reuse

Published May 28, 2023 · Updated Jan 14, 2025

Denial of service in Libreswan 3.28 through 4.10 allows remote attackers to crash the pluto daemon via IKEv1 Aggressive Mode packets. The IKEv1 handler sends a nonzero responder SPI after rejecting all proposed algorithms, then mishandles a repeated packet that reuses that SPI and crashes the state machine. Exploitation requires an explicitly configured Aggressive Mode connection and a peer able to receive the reply; the daemon restarts, and remote code execution is not possible.

CVSS severity7.5
High
EPSS probability1.19%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in Libreswan 3.28 through 4.10 allows remote attackers to crash the pluto daemon via IKEv1 Aggressive Mode packets. The IKEv1 handler sends a nonzero responder SPI after rejecting all proposed algorithms, then mishandles a repeated packet that reuses that SPI and crashes the state machine. Exploitation requires an explicitly configured Aggressive Mode connection and a peer able to receive the reply; the daemon restarts, and remote code execution is not possible.

The record

CVE
CVE-2023-30570
Published
May 28, 2023
Updated
Jan 14, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-400, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 28, 2023CVE publishedPublication date reported by the CVE source.
  2. Jan 14, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.5Red HatCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
7.5NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
7.5CISACVSS: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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-400Uncontrolled Resource Consumption
T1499.004Application or System Exploitation

Public exploit references

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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