CVE-2021-22947 (GCVE-0-2021-22947)

Vulnerability from cvelistv5 – Published: 2021-09-29 00:00 – Updated: 2026-04-16 14:01
VLAI
Summary
When curl >= 7.20.0 and <= 7.78.0 connects to an IMAP or POP3 server to retrieve data using STARTTLS to upgrade to TLS security, the server can respond and send back multiple responses at once that curl caches. curl would then upgrade to TLS but not flush the in-queue of cached responses but instead continue using and trustingthe responses it got *before* the TLS handshake as if they were authenticated.Using this flaw, it allows a Man-In-The-Middle attacker to first inject the fake responses, then pass-through the TLS traffic from the legitimate server and trick curl into sending data back to the user thinking the attacker's injected data comes from the TLS-protected server.
Severity
5.9 (Medium)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
SSVC
Exploitation: poc Automatable: no Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
  • CWE-310 - Cryptographic Issues - Generic (CWE-310)
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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      "id": "CVE-2021-22947",
      "lastModified": "2024-11-21T05:50:59.810",
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      "published": "2021-09-29T20:15:08.253",
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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-06-28T11:46:29+00:00",
      "cve": "CVE-2021-22947",
      "id": "CVE-2021-22947",
      "initial_release_date": "2021-09-15T00:00:00+00:00",
      "product_status:fixed": "105",
      "product_status:known_affected": "13",
      "product_status:known_not_affected": "11",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "curl: Server responses received before STARTTLS processed after TLS handshake",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2021/cve-2021-22947.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-06-06T06:22:56Z",
      "cve": "CVE-2021-22947",
      "id": "CVE-2021-22947",
      "initial_release_date": "2023-02-15T03:45:44Z",
      "product_status:known_affected": "319",
      "product_status:recommended": "388",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2021-22947",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2021-22947.json",
      "version": "49"
    },
    "vulnrichment": {
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\"https://www.oracle.com/security-alerts/cpujan2022.html\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://security.netapp.com/advisory/ntap-20211029-0003/\", \"tags\": [\"x_transferred\"]}, {\"url\": \"http://seclists.org/fulldisclosure/2022/Mar/29\", \"name\": \"20220314 APPLE-SA-2022-03-14-4 macOS Monterey 12.3\", \"tags\": [\"mailing-list\", \"x_transferred\"]}, {\"url\": \"https://www.oracle.com/security-alerts/cpuapr2022.html\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://support.apple.com/kb/HT213183\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://www.oracle.com/security-alerts/cpujul2022.html\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://www.debian.org/security/2022/dsa-5197\", \"name\": \"DSA-5197\", \"tags\": [\"vendor-advisory\", \"x_transferred\"]}, {\"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\", \"x_transferred\"]}, {\"url\": \"https://security.gentoo.org/glsa/202212-01\", \"name\": \"GLSA-202212-01\", \"tags\": [\"vendor-advisory\", \"x_transferred\"]}], \"providerMetadata\": {\"orgId\": \"af854a3a-2127-422b-91ae-364da2661108\", \"shortName\": \"CVE\", \"dateUpdated\": \"2024-08-03T18:58:26.408Z\"}}, {\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"cvssV3_1\": {\"scope\": \"UNCHANGED\", \"version\": \"3.1\", \"baseScore\": 5.9, \"attackVector\": \"NETWORK\", \"baseSeverity\": \"MEDIUM\", \"vectorString\": \"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N\", \"integrityImpact\": \"HIGH\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"HIGH\", \"availabilityImpact\": \"NONE\", \"privilegesRequired\": \"NONE\", \"confidentialityImpact\": \"NONE\"}}, {\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2021-22947\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"poc\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2024-03-28T18:31:17.165329Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-04-16T14:00:27.350Z\"}}], \"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/1334763\"}, {\"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\": \"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\": \"When curl \u003e= 7.20.0 and \u003c= 7.78.0 connects to an IMAP or POP3 server to retrieve data using STARTTLS to upgrade to TLS security, the server can respond and send back multiple responses at once that curl caches. curl would then upgrade to TLS but not flush the in-queue of cached responses but instead continue using and trustingthe responses it got *before* the TLS handshake as if they were authenticated.Using this flaw, it allows a Man-In-The-Middle attacker to first inject the fake responses, then pass-through the TLS traffic from the legitimate server and trick curl into sending data back to the user thinking the attacker\u0027s injected data comes from the TLS-protected server.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-310\", \"description\": \"Cryptographic Issues - Generic (CWE-310)\"}]}], \"providerMetadata\": {\"orgId\": \"36234546-b8fa-4601-9d6f-f4e334aa8ea1\", \"shortName\": \"hackerone\", \"dateUpdated\": \"2022-12-19T00:00:00.000Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2021-22947\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-04-16T14:01:05.826Z\", \"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.