CVE-2023-47091Network attack vector

IPsec connection denial via cookie-threshold exhaustion

Published Dec 25, 2023 · Updated Apr 23, 2025

Denial of service in Stormshield Network Security SNS allows remote attackers to prevent new IPsec connections by exhausting the cookie threshold. Stormshield identifies the locus as the IPsec daemon and states that cookies can exceed the configured CookieThreshold limit; the faulty threshold-handling operation is undisclosed. Network access without authentication or user interaction is sufficient; affected releases are 4.3.13 through 4.3.22, 4.6.0 through 4.6.9, and 4.7.0 through 4.7.1, and the documented consequence is loss of IPsec connection availability rather than firewall shutdown.

CVSS severity5.3
Medium
EPSS probability0.53%
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 Stormshield Network Security SNS allows remote attackers to prevent new IPsec connections by exhausting the cookie threshold. Stormshield identifies the locus as the IPsec daemon and states that cookies can exceed the configured CookieThreshold limit; the faulty threshold-handling operation is undisclosed. Network access without authentication or user interaction is sufficient; affected releases are 4.3.13 through 4.3.22, 4.6.0 through 4.6.9, and 4.7.0 through 4.7.1, and the documented consequence is loss of IPsec connection availability rather than firewall shutdown.

The record

CVE
CVE-2023-47091
Published
Dec 25, 2023
Updated
Apr 23, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-120, T1499.002
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 25, 2023CVE publishedPublication date reported by the CVE source.
  2. Apr 23, 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

5.3StormshieldCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
7.5CISA-ADPCVSS: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
4.8StormshieldCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:P/RL:O/RC:C

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-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
T1499.002Service Exhaustion Flood

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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