msrc_cve-2021-23840
Vulnerability from csaf_microsoft
Published
2021-02-02 00:00
Modified
2025-09-03 20:05
Summary
Integer overflow in CipherUpdate
Notes
Additional Resources
To determine the support lifecycle for your software, see the Microsoft Support Lifecycle: https://support.microsoft.com/lifecycle
Disclaimer
The information provided in the Microsoft Knowledge Base is provided \"as is\" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply.
{
"document": {
"category": "csaf_vex",
"csaf_version": "2.0",
"distribution": {
"text": "Public",
"tlp": {
"label": "WHITE",
"url": "https://www.first.org/tlp/"
}
},
"lang": "en-US",
"notes": [
{
"category": "general",
"text": "To determine the support lifecycle for your software, see the Microsoft Support Lifecycle: https://support.microsoft.com/lifecycle",
"title": "Additional Resources"
},
{
"category": "legal_disclaimer",
"text": "The information provided in the Microsoft Knowledge Base is provided \\\"as is\\\" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply.",
"title": "Disclaimer"
}
],
"publisher": {
"category": "vendor",
"contact_details": "secure@microsoft.com",
"name": "Microsoft Security Response Center",
"namespace": "https://msrc.microsoft.com"
},
"references": [
{
"category": "self",
"summary": "CVE-2021-23840 Integer overflow in CipherUpdate - VEX",
"url": "https://msrc.microsoft.com/csaf/vex/2021/msrc_cve-2021-23840.json"
},
{
"category": "external",
"summary": "Microsoft Support Lifecycle",
"url": "https://support.microsoft.com/lifecycle"
},
{
"category": "external",
"summary": "Common Vulnerability Scoring System",
"url": "https://www.first.org/cvss"
}
],
"title": "Integer overflow in CipherUpdate",
"tracking": {
"current_release_date": "2025-09-03T20:05:49.000Z",
"generator": {
"date": "2025-10-19T21:43:39.683Z",
"engine": {
"name": "MSRC Generator",
"version": "1.0"
}
},
"id": "msrc_CVE-2021-23840",
"initial_release_date": "2021-02-02T00:00:00.000Z",
"revision_history": [
{
"date": "2025-09-03T20:05:49.000Z",
"legacy_version": "1",
"number": "1",
"summary": "Information published."
}
],
"status": "final",
"version": "1"
}
},
"product_tree": {
"branches": [
{
"branches": [
{
"branches": [
{
"category": "product_version",
"name": "3.0",
"product": {
"name": "Azure Linux 3.0",
"product_id": "17084"
}
}
],
"category": "product_name",
"name": "Azure Linux"
},
{
"branches": [
{
"category": "product_version_range",
"name": "\u003cazl3 shim-unsigned-x64 1.1.1-1",
"product": {
"name": "\u003cazl3 shim-unsigned-x64 1.1.1-1",
"product_id": "1"
}
},
{
"category": "product_version",
"name": "azl3 shim-unsigned-x64 1.1.1-1",
"product": {
"name": "azl3 shim-unsigned-x64 1.1.1-1",
"product_id": "19079"
}
}
],
"category": "product_name",
"name": "shim-unsigned-x64"
},
{
"category": "product_name",
"name": "azl3 shim-unsigned-x64 15.8-5",
"product": {
"name": "azl3 shim-unsigned-x64 15.8-5",
"product_id": "3"
}
},
{
"category": "product_name",
"name": "azl3 shim-unsigned-aarch64 15.8-5",
"product": {
"name": "azl3 shim-unsigned-aarch64 15.8-5",
"product_id": "2"
}
}
],
"category": "vendor",
"name": "Microsoft"
}
],
"relationships": [
{
"category": "default_component_of",
"full_product_name": {
"name": "azl3 shim-unsigned-x64 15.8-5 as a component of Azure Linux 3.0",
"product_id": "17084-3"
},
"product_reference": "3",
"relates_to_product_reference": "17084"
},
{
"category": "default_component_of",
"full_product_name": {
"name": "\u003cazl3 shim-unsigned-x64 1.1.1-1 as a component of Azure Linux 3.0",
"product_id": "17084-1"
},
"product_reference": "1",
"relates_to_product_reference": "17084"
},
{
"category": "default_component_of",
"full_product_name": {
"name": "azl3 shim-unsigned-x64 1.1.1-1 as a component of Azure Linux 3.0",
"product_id": "19079-17084"
},
"product_reference": "19079",
"relates_to_product_reference": "17084"
},
{
"category": "default_component_of",
"full_product_name": {
"name": "azl3 shim-unsigned-aarch64 15.8-5 as a component of Azure Linux 3.0",
"product_id": "17084-2"
},
"product_reference": "2",
"relates_to_product_reference": "17084"
}
]
},
"vulnerabilities": [
{
"cve": "CVE-2021-23840",
"cwe": {
"id": "CWE-190",
"name": "Integer Overflow or Wraparound"
},
"flags": [
{
"label": "component_not_present",
"product_ids": [
"17084-3",
"17084-2"
]
}
],
"notes": [
{
"category": "general",
"text": "openssl",
"title": "Assigning CNA"
}
],
"product_status": {
"fixed": [
"19079-17084"
],
"known_affected": [
"17084-1"
],
"known_not_affected": [
"17084-3",
"17084-2"
]
},
"references": [
{
"category": "self",
"summary": "CVE-2021-23840 Integer overflow in CipherUpdate - VEX",
"url": "https://msrc.microsoft.com/csaf/vex/2021/msrc_cve-2021-23840.json"
}
],
"remediations": [
{
"category": "vendor_fix",
"date": "2025-09-03T20:05:49.000Z",
"details": "1.1.1-1:Security Update:https://learn.microsoft.com/en-us/azure/azure-linux/tutorial-azure-linux-upgrade",
"product_ids": [
"17084-1"
],
"url": "https://learn.microsoft.com/en-us/azure/azure-linux/tutorial-azure-linux-upgrade"
}
],
"scores": [
{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 7.5,
"baseSeverity": "HIGH",
"confidentialityImpact": "NONE",
"environmentalsScore": 0.0,
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"temporalScore": 7.5,
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
},
"products": [
"17084-1"
]
}
],
"title": "Integer overflow in CipherUpdate"
}
]
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
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