CVE-2021-41145— FreeSWITCH susceptible to Denial of Service via SIP flooding
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I. Basic Information for CVE-2021-41145
Vulnerability Information
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Vulnerability Title
FreeSWITCH susceptible to Denial of Service via SIP flooding
Source: NVD (National Vulnerability Database)
Vulnerability 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.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
未加控制的资源消耗(资源穷尽)
Source: NVD (National Vulnerability Database)
Vulnerability Title
FreeSWITCH 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
FreeSWITCH是美国Anthony Minessale个人开发者的研发的一套免费、开源的通信软件。该软件可用于创建音、视频以及短消息类产品和应用。 FreeSWITCH 存在资源管理错误漏洞，该漏洞源于版本1.10.7之前的FreeSWITCH很容易通过SIP洪水拒绝服务。攻击者可利用该漏洞用SIP消息淹没任何freeeswitch实例，从而导致拒绝服务。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| signalwire | freeswitch | < 1.10.7 | - |
II. Public POCs for CVE-2021-41145
| # | POC Description | Source Link | Shenlong Link |
|---|
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- https://github.com/signalwire/freeswitch/releases/tag/v1.10.7x_refsource_MISC
- https://nvd.nist.gov/vuln/detail/CVE-2021-41145
Same Patch Batch · signalwire · 2021-10-25 · 3 CVEs total
| CVE-2021-37624 | 7.5 HIGH | FreeSWITCH does not authenticate SIP MESSAGE requests, leading to spam and message spoofin |
| CVE-2021-41105 | 7.5 HIGH | FreeSWITCH susceptible to Denial of Service via invalid SRTP packets |
IV. Related Vulnerabilities
Same product: freeswitch
- CVE-2023-51443
FreeSWITCH susceptible to Denial of Service via DTLS Hello p - CVE-2023-40019
FreeSWITCH allows authorized users to cause a denial of serv - CVE-2023-40018
FreeSWITCH allows remote users to trigger out of bounds writ - CVE-2021-41158
FreeSWITCH vulnerable to SIP digest leak for configured gate - CVE-2021-41157
FreeSWITCH does not authenticate SIP SUBSCRIBE requests by d
Same vendor: signalwire
- CVE-2023-51443
FreeSWITCH susceptible to Denial of Service via DTLS Hello p - CVE-2023-40019
FreeSWITCH allows authorized users to cause a denial of serv - CVE-2023-40018
FreeSWITCH allows remote users to trigger out of bounds writ - CVE-2021-41158
FreeSWITCH vulnerable to SIP digest leak for configured gate - CVE-2021-41157
FreeSWITCH does not authenticate SIP SUBSCRIBE requests by d
Same weakness: CWE-400
- CVE-2026-8187
Open5GS UPF gtp-path.c _gtpv1_u_recv_cb resource consumption - CVE-2026-42343
FastGPT: Uncontrolled Resource Consumption leading to Sandbo - CVE-2026-42212
SolidCAM-GPPL-IDE: XML External Entity (XXE) and billion-lau - CVE-2026-32686
Unbounded exponent in decimal enables unauthenticated DoS - CVE-2026-20188
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V. Comments for CVE-2021-41145
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