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Protocol downgrade required TLS bypassed

🗓️ 15 Sep 2021 08:00:00Reported by curlType 
curl
 curl🔗 curl.se👁 3 Views

Curl may require TLS upgrade for IMAP, POP3, and FTP, but a crafted response can bypass and proceed without TLS.

Related
Detection
Refs
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IBM Security Bulletins		Security Bulletin: Vulnerabilities in libcurl may affect IBM Spectrum Copy Data Management (CVE-2022-27782, CVE-2022-27774, CVE-2021-22947, CVE-2022-22576, CVE-2022-27776, CVE-2021-22946)
17 Sep 202202:05
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IBM Security Bulletins		Security Bulletin: Vulnerabilities in libcurl may affect IBM Spectrum Protect Plus (CVE-2021-22946, CVE-2022-27782, CVE-2022-27774, CVE-2022-22576, CVE-2021-22947, CVE-2022-27776)
17 Sep 202212:04
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IBM Security Bulletins		Security Bulletin: Multiple vulnerabilities in Curl affect PowerSC
1 Nov 202120:13
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IBM Security Bulletins		Security Bulletin: Execution Engine for Apache Hadoop is vulnerable to heap-based buffer overflow and remote attacker to bypass security restrictions
20 Feb 202503:40
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IBM Security Bulletins		Security Bulletin: IBM MQ is vulnerable to multiple issues with libcurl (CVE-2021-22946, CVE-2021-22947)
17 Dec 202113:33
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IBM Security Bulletins		Security Bulletin: IBM QRadar WinCollect is vulnerable to using components with known vulnerabilities
17 Jun 202218:45
–ibm
IBM Security Bulletins		Security Bulletin: IBM Watson Speech Services Cartridge v4.8.7 is vulnerable to multiple Operator package issues
26 Mar 202503:42
–ibm
IBM Security Bulletins		Security Bulletin: Security Vulnerabilities affect IBM Cloud Private - curl (CVE-2021-22946)
22 Apr 202220:04
–ibm
IBM Security Bulletins		Security Bulletin: IBM QRadar SIEM is vulnerable to using components with Known Vulnerabilities
25 Apr 202214:44
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Rows per page
Vulners
Node
haxxcurlRange7.20.0–7.79.0
OR
haxxlibcurlRange7.20.0–7.79.0

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25 Apr 2026 17:48Current
6.5Medium risk
Vulners AI Score6.5
CVSS 25
CVSS 3.17.5
EPSS0.00063
SSVC
CWE-325
transport layer securitycurl toolimap protocolpop3 protocolftp protocolbypass vulnerabilitycrafted server response
3