CVE-2021-22946 (GCVE-0-2021-22946)

Vulnerability from cvelistv5 – Published: 2021-09-29 00:00 – Updated: 2026-04-16 13:53
VLAI
Summary
A user can tell curl >= 7.20.0 and <= 7.78.0 to require a successful upgrade to TLS when speaking to an IMAP, POP3 or FTP server (`--ssl-reqd` on the command line or`CURLOPT_USE_SSL` set to `CURLUSESSL_CONTROL` or `CURLUSESSL_ALL` withlibcurl). This requirement could be bypassed if the server would return a properly crafted but perfectly legitimate response.This flaw would then make curl silently continue its operations **withoutTLS** contrary to the instructions and expectations, exposing possibly sensitive data in clear text over the network.
Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
CWE
  • CWE-325 - Missing Required Cryptographic Step (CWE-325)
Assigner
References
Impacted products
Vendor Product Version
n/a https://github.com/curl/curl Affected: curl 7.20.0 to and including 7.78.0
Show details on NVD website
To clipboard 

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{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2021-22946\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"poc\"}, {\"Automatable\": \"yes\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-04-16T13:53:35.942299Z\"}}}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-319\", \"description\": \"CWE-319 Cleartext Transmission of Sensitive Information\"}]}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-04-16T13:52:56.114Z\"}}], \"cna\": {\"affected\": [{\"vendor\": \"n/a\", \"product\": \"https://github.com/curl/curl\", \"versions\": [{\"status\": \"affected\", \"version\": \"curl 7.20.0 to and including 7.78.0\"}]}], \"references\": [{\"url\": \"https://hackerone.com/reports/1334111\"}, {\"url\": \"https://lists.debian.org/debian-lts-announce/2021/09/msg00022.html\", \"name\": \"[debian-lts-announce] 20210930 [SECURITY] [DLA 2773-1] curl security update\", \"tags\": [\"mailing-list\"]}, {\"url\": \"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RWLEC6YVEM2HWUBX67SDGPSY4CQB72OE/\", \"name\": \"FEDORA-2021-fc96a3a749\", \"tags\": [\"vendor-advisory\"]}, {\"url\": \"https://www.oracle.com/security-alerts/cpuoct2021.html\"}, {\"url\": \"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/APOAK4X73EJTAPTSVT7IRVDMUWVXNWGD/\", \"name\": \"FEDORA-2021-1d24845e93\", \"tags\": [\"vendor-advisory\"]}, {\"url\": \"https://www.oracle.com/security-alerts/cpujan2022.html\"}, {\"url\": \"https://security.netapp.com/advisory/ntap-20211029-0003/\"}, {\"url\": \"https://security.netapp.com/advisory/ntap-20220121-0008/\"}, {\"url\": \"http://seclists.org/fulldisclosure/2022/Mar/29\", \"name\": \"20220314 APPLE-SA-2022-03-14-4 macOS Monterey 12.3\", \"tags\": [\"mailing-list\"]}, {\"url\": \"https://www.oracle.com/security-alerts/cpuapr2022.html\"}, {\"url\": \"https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf\"}, {\"url\": \"https://support.apple.com/kb/HT213183\"}, {\"url\": \"https://www.oracle.com/security-alerts/cpujul2022.html\"}, {\"url\": \"https://www.debian.org/security/2022/dsa-5197\", \"name\": \"DSA-5197\", \"tags\": [\"vendor-advisory\"]}, {\"url\": \"https://lists.debian.org/debian-lts-announce/2022/08/msg00017.html\", \"name\": \"[debian-lts-announce] 20220828 [SECURITY] [DLA 3085-1] curl security update\", \"tags\": [\"mailing-list\"]}, {\"url\": \"https://security.gentoo.org/glsa/202212-01\", \"name\": \"GLSA-202212-01\", \"tags\": [\"vendor-advisory\"]}], \"descriptions\": [{\"lang\": \"en\", \"value\": \"A user can tell curl \u003e= 7.20.0 and \u003c= 7.78.0 to require a successful upgrade to TLS when speaking to an IMAP, POP3 or FTP server (`--ssl-reqd` on the command line or`CURLOPT_USE_SSL` set to `CURLUSESSL_CONTROL` or `CURLUSESSL_ALL` withlibcurl). This requirement could be bypassed if the server would return a properly crafted but perfectly legitimate response.This flaw would then make curl silently continue its operations **withoutTLS** contrary to the instructions and expectations, exposing possibly sensitive data in clear text over the network.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-325\", \"description\": \"Missing Required Cryptographic Step (CWE-325)\"}]}], \"providerMetadata\": {\"orgId\": \"36234546-b8fa-4601-9d6f-f4e334aa8ea1\", \"shortName\": \"hackerone\", \"dateUpdated\": \"2022-12-19T00:00:00.000Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2021-22946\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-04-16T13:53:47.481Z\", \"dateReserved\": \"2021-01-06T00:00:00.000Z\", \"assignerOrgId\": \"36234546-b8fa-4601-9d6f-f4e334aa8ea1\", \"datePublished\": \"2021-09-29T00:00:00.000Z\", \"assignerShortName\": \"hackerone\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.