CVE-2023-40018Public exploitNetwork attack vector

Service crash via unchecked ICE component identifier

Published Sep 15, 2023 · Updated Sep 25, 2024

Out-of-bounds write in FreeSWITCH before 1.10.10 allows remote attackers to crash the service via a crafted SDP offer. The ICE candidate parser uses an unknown component identifier as an array index without validating that the value is within the supported component range. A network-reachable signaling path that accepts an SDP offer is required; malformed candidate values corrupt process memory and can terminate the service.

CVSS severity7.5
High
EPSS probability0.99%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds write in FreeSWITCH before 1.10.10 allows remote attackers to crash the service via a crafted SDP offer. The ICE candidate parser uses an unknown component identifier as an array index without validating that the value is within the supported component range. A network-reachable signaling path that accepts an SDP offer is required; malformed candidate values corrupt process memory and can terminate the service.

The record

CVE
CVE-2023-40018
Published
Sep 15, 2023
Updated
Sep 25, 2024
Vendor
SignalWire
Product
FreeSWITCH
Classifications
CWE-787, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 15, 2023CVE publishedPublication date reported by the CVE source.
  2. Sep 25, 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=< 1.10.10

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

SignalWire · FreeSWITCHversion=< 1.10.10

Published CVSS scores

7.5GitHub CNACVSS: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.

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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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-787Out-of-bounds Write
T1499.004Endpoint Denial of Service: Application 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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