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Vulnerability from cleanstart
Published
2026-07-30 07:10
Modified
2026-07-30 09:38
Summary
Security fixes in curl 7.79.0-r0
Details
Package curl version 7.79.0-r0 fixes 3 vulnerabilities: CVE-2021-22945, CVE-2021-22946, CVE-2021-22947
References
| URL | Type | ||||
|---|---|---|---|---|---|
|
|||||
{
"affected": [
{
"package": {
"ecosystem": "Alpine",
"name": "curl"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "7.79.0-r0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"7.79.0-r0"
]
}
],
"credits": [],
"database_specific": {},
"details": "Package curl version 7.79.0-r0 fixes 3 vulnerabilities: CVE-2021-22945, CVE-2021-22946, CVE-2021-22947",
"id": "CLEANSTART-2026-DU81055",
"modified": "2026-07-30T09:38:45Z",
"published": "2026-07-30T07:10:53Z",
"references": [
{
"type": "WEB",
"url": "https://curl.se/"
}
],
"related": [],
"schema_version": "1.7.3",
"summary": "Security fixes in curl 7.79.0-r0",
"upstream": [
"CVE-2021-22945",
"CVE-2021-22946",
"CVE-2021-22947"
]
}
CVE-2021-22945 (GCVE-0-2021-22945)
Vulnerability from cvelistv5 – Published: 2021-09-23 00:00 – Updated: 2025-06-09 14:47
VLAI
EPSS
VEX
Summary
When sending data to an MQTT server, libcurl <= 7.73.0 and 7.78.0 could in some circumstances erroneously keep a pointer to an already freed memory area and both use that again in a subsequent call to send data and also free it *again*.
Severity
9.1 (Critical)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
Assigner
References
10 references
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| n/a | https://github.com/curl/curl |
Affected:
curl 7.73.0 to and including 7.78.0
|
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CVE-2021-22946 (GCVE-0-2021-22946)
Vulnerability from cvelistv5 – Published: 2021-09-29 00:00 – Updated: 2026-04-16 13:53
VLAI
EPSS
VEX
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)
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
Assigner
References
16 references
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| n/a | https://github.com/curl/curl |
Affected:
curl 7.20.0 to and including 7.78.0
|
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CVE-2021-22947 (GCVE-0-2021-22947)
Vulnerability from cvelistv5 – Published: 2021-09-29 00:00 – Updated: 2026-04-16 14:01
VLAI
EPSS
VEX
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)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-310 - Cryptographic Issues - Generic (CWE-310)
Assigner
References
15 references
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| n/a | https://github.com/curl/curl |
Affected:
curl 7.20.0 to and including 7.78.0
|
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},
{
"name": "[debian-lts-announce] 20220828 [SECURITY] [DLA 3085-1] curl security update",
"tags": [
"mailing-list",
"x_transferred"
],
"url": "https://lists.debian.org/debian-lts-announce/2022/08/msg00017.html"
},
{
"name": "GLSA-202212-01",
"tags": [
"vendor-advisory",
"x_transferred"
],
"url": "https://security.gentoo.org/glsa/202212-01"
}
],
"title": "CVE Program Container"
},
{
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "HIGH",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 5.9,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N",
"version": "3.1"
}
},
{
"other": {
"content": {
"id": "CVE-2021-22947",
"options": [
{
"Exploitation": "poc"
},
{
"Automatable": "no"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2024-03-28T18:31:17.165329Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2026-04-16T14:01:05.826Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"product": "https://github.com/curl/curl",
"vendor": "n/a",
"versions": [
{
"status": "affected",
"version": "curl 7.20.0 to and including 7.78.0"
}
]
}
],
"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": [
{
"cweId": "CWE-310",
"description": "Cryptographic Issues - Generic (CWE-310)",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2022-12-19T00:00:00.000Z",
"orgId": "36234546-b8fa-4601-9d6f-f4e334aa8ea1",
"shortName": "hackerone"
},
"references": [
{
"url": "https://hackerone.com/reports/1334763"
},
{
"name": "[debian-lts-announce] 20210930 [SECURITY] [DLA 2773-1] curl security update",
"tags": [
"mailing-list"
],
"url": "https://lists.debian.org/debian-lts-announce/2021/09/msg00022.html"
},
{
"name": "FEDORA-2021-fc96a3a749",
"tags": [
"vendor-advisory"
],
"url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RWLEC6YVEM2HWUBX67SDGPSY4CQB72OE/"
},
{
"url": "https://www.oracle.com/security-alerts/cpuoct2021.html"
},
{
"name": "FEDORA-2021-1d24845e93",
"tags": [
"vendor-advisory"
],
"url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/APOAK4X73EJTAPTSVT7IRVDMUWVXNWGD/"
},
{
"url": "https://www.oracle.com/security-alerts/cpujan2022.html"
},
{
"url": "https://security.netapp.com/advisory/ntap-20211029-0003/"
},
{
"name": "20220314 APPLE-SA-2022-03-14-4 macOS Monterey 12.3",
"tags": [
"mailing-list"
],
"url": "http://seclists.org/fulldisclosure/2022/Mar/29"
},
{
"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"
},
{
"name": "DSA-5197",
"tags": [
"vendor-advisory"
],
"url": "https://www.debian.org/security/2022/dsa-5197"
},
{
"name": "[debian-lts-announce] 20220828 [SECURITY] [DLA 3085-1] curl security update",
"tags": [
"mailing-list"
],
"url": "https://lists.debian.org/debian-lts-announce/2022/08/msg00017.html"
},
{
"name": "GLSA-202212-01",
"tags": [
"vendor-advisory"
],
"url": "https://security.gentoo.org/glsa/202212-01"
}
]
}
},
"cveMetadata": {
"assignerOrgId": "36234546-b8fa-4601-9d6f-f4e334aa8ea1",
"assignerShortName": "hackerone",
"cveId": "CVE-2021-22947",
"datePublished": "2021-09-29T00:00:00.000Z",
"dateReserved": "2021-01-06T00:00:00.000Z",
"dateUpdated": "2026-04-16T14:01:05.826Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
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Trend slope:
-
(linear fit over daily sighting counts)
Show additional events:
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
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.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
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