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No exploitation reportedFix available

CVE-2021-41145

No exploitation reported by the sources we read.

  • Published2021-10-25
  • Fixed in1.10.7
  • WeaknessCWE-400 · CWE-401

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

FreeSWITCH is a Software Defined Telecom Stack enabling the digital transformation from proprietary telecom switches to a software implementation that runs on any commodity hardware. FreeSWITCH prior to version 1.10.7 is susceptible to Denial of Service via SIP flooding. When flooding FreeSWITCH with SIP messages, it was observed that after a number of seconds the process was killed by the operating system due to memory exhaustion. By abusing this vulnerability, an attacker is able to crash any FreeSWITCH instance by flooding it with SIP messages, leading to Denial of Service. The attack does not require authentication and can be carried out over UDP, TCP or TLS. This issue was patched in version 1.10.7.

Timeline

dates in UTC
  1. 2021-10-2522:15CVE publishedNVD

Versions per branch

NVD
Freeswitch
BranchAffectedFixed in
1.10< 1.10.71.10.7

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • freeswitchCleanStartall versions · fixed in 1.10.7-r0
  • freeswitchAlpine:v3.24all versions · fixed in 1.10.7-r0
  • freeswitchAlpine:v3.23all versions · fixed in 1.10.7-r0
  • freeswitchAlpine:v3.22all versions · fixed in 1.10.7-r0
  • freeswitchAlpine:v3.21all versions · fixed in 1.10.7-r0
  • freeswitchAlpine:v3.20all versions · fixed in 1.10.7-r0
  • freeswitchAlpine:v3.19all versions · fixed in 1.10.7-r0
  • freeswitchAlpine:v3.18all versions · fixed in 1.10.7-r0

3 more package ranges on OSV.dev

Full record on NVD

Fix

  1. Update Freeswitch to 1.10.7

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

  • CNACVSS 3.18.6known since 2026-10-23
  • NVDCVSS 3.17.5read 2026-10-23
  • NVDCVSS 2.05read 2026-10-23
  • CNAweakness (CWE)CWE-400known since 2026-10-23
  • NVDweakness (CWE)CWE-401read 2026-10-23
  • FIRST EPSSEPSS score1.7 %2026-11-08
  • OSVaffected packages—

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published
2021-10-25
Last Modified
2026-06-17
NVD status
Modified

Frequently asked questions

What is CVE-2021-41145?

FreeSWITCH is a Software Defined Telecom Stack enabling the digital transformation from proprietary telecom switches to a software implementation that runs on any commodity hardware. FreeSWITCH prior to version 1.10.7 is susceptible to Denial of Service via SIP flooding. When flooding FreeSWITCH with SIP messages, it was observed that after a number of seconds the process was killed by the operating system due to memory exhaustion. By abusing this vulnerability, an attacker is able to crash any FreeSWITCH instance by flooding it with SIP messages, leading to Denial of Service. The attack does not require authentication and can be carried out over UDP, TCP or TLS. This issue was patched in version 1.10.7.

Is CVE-2021-41145 actively exploited?

Active exploitation of CVE-2021-41145 has not been confirmed. Its EPSS score was 1.7% on 2026-11-08, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2021-41145?

CVE-2021-41145 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

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