Historical advisory recorded 23 Oct 2026 15:48:27 UTC. Read the latest advisory.
Affected versions, risk and source history
cve-program · CVE-2021-26858
PublishedMicrosoft Exchange Server 2013 Cumulative Update 21
Vendor product
Publisher's version information
Shown as published. These rules are not interpreted as NuGet package version ranges.
{
"vendor": "Microsoft",
"product": "Microsoft Exchange Server 2013 Cumulative Update 21",
"platforms": [
"x64-based Systems"
],
"versions": [
{
"version": "15.00.0",
"lessThan": "15.00.1395.012",
"versionType": "custom",
"status": "affected"
}
]
}Microsoft Exchange Server 2013 Cumulative Update 22
Vendor product
Publisher's version information
Shown as published. These rules are not interpreted as NuGet package version ranges.
{
"vendor": "Microsoft",
"product": "Microsoft Exchange Server 2013 Cumulative Update 22",
"platforms": [
"x64-based Systems"
],
"versions": [
{
"version": "15.00.0",
"lessThan": "15.00.1473.006",
"versionType": "custom",
"status": "affected"
}
]
}Microsoft Exchange Server 2013 Cumulative Update 23
Vendor product
Publisher's version information
Shown as published. These rules are not interpreted as NuGet package version ranges.
{
"vendor": "Microsoft",
"product": "Microsoft Exchange Server 2013 Cumulative Update 23",
"platforms": [
"x64-based Systems"
],
"versions": [
{
"version": "15.00.0",
"lessThan": "15.00.1497.012",
"versionType": "custom",
"status": "affected"
}
]
}Microsoft Exchange Server 2016 Cumulative Update 10
Vendor product
Publisher's version information
Shown as published. These rules are not interpreted as NuGet package version ranges.
{
"vendor": "Microsoft",
"product": "Microsoft Exchange Server 2016 Cumulative Update 10",
"platforms": [
"x64-based Systems"
],
"versions": [
{
"version": "15.01.0",
"lessThan": "15.01.1531.012",
"versionType": "custom",
"status": "affected"
}
]
}Microsoft Exchange Server 2016 Cumulative Update 11
Vendor product
Publisher's version information
Shown as published. These rules are not interpreted as NuGet package version ranges.
{
"vendor": "Microsoft",
"product": "Microsoft Exchange Server 2016 Cumulative Update 11",
"platforms": [
"x64-based Systems"
],
"versions": [
{
"version": "15.01.0",
"lessThan": "15.01.1591.018",
"versionType": "custom",
"status": "affected"
}
]
}Microsoft Exchange Server 2016 Cumulative Update 12
Vendor product
Publisher's version information
Shown as published. These rules are not interpreted as NuGet package version ranges.
{
"vendor": "Microsoft",
"product": "Microsoft Exchange Server 2016 Cumulative Update 12",
"platforms": [
"x64-based Systems"
],
"versions": [
{
"version": "15.01.0",
"lessThan": "15.01.1713.010",
"versionType": "custom",
"status": "affected"
}
]
}Microsoft Exchange Server 2016 Cumulative Update 13
Vendor product
Publisher's version information
Shown as published. These rules are not interpreted as NuGet package version ranges.
{
"vendor": "Microsoft",
"product": "Microsoft Exchange Server 2016 Cumulative Update 13",
"platforms": [
"x64-based Systems"
],
"versions": [
{
"version": "15.01.0",
"lessThan": "15.01.1779.008",
"versionType": "custom",
"status": "affected"
}
]
}Microsoft Exchange Server 2016 Cumulative Update 14
Vendor product
Publisher's version information
Shown as published. These rules are not interpreted as NuGet package version ranges.
{
"vendor": "Microsoft",
"product": "Microsoft Exchange Server 2016 Cumulative Update 14",
"platforms": [
"x64-based Systems"
],
"versions": [
{
"version": "15.01.0",
"lessThan": "15.01.1847.012",
"versionType": "custom",
"status": "affected"
}
]
}Microsoft Exchange Server 2016 Cumulative Update 15
Vendor product
Publisher's version information
Shown as published. These rules are not interpreted as NuGet package version ranges.
{
"vendor": "Microsoft",
"product": "Microsoft Exchange Server 2016 Cumulative Update 15",
"platforms": [
"x64-based Systems"
],
"versions": [
{
"version": "15.01.0",
"lessThan": "15.01.1913.012",
"versionType": "custom",
"status": "affected"
}
]
}Microsoft Exchange Server 2016 Cumulative Update 16
Vendor product
Publisher's version information
Shown as published. These rules are not interpreted as NuGet package version ranges.
{
"vendor": "Microsoft",
"product": "Microsoft Exchange Server 2016 Cumulative Update 16",
"platforms": [
"x64-based Systems"
],
"versions": [
{
"version": "15.01.0",
"lessThan": "15.01.1979.008",
"versionType": "custom",
"status": "affected"
}
]
}Microsoft Exchange Server 2016 Cumulative Update 17
Vendor product
Publisher's version information
Shown as published. These rules are not interpreted as NuGet package version ranges.
{
"vendor": "Microsoft",
"product": "Microsoft Exchange Server 2016 Cumulative Update 17",
"platforms": [
"x64-based Systems"
],
"versions": [
{
"version": "15.01.0",
"lessThan": "15.01.2044.013",
"versionType": "custom",
"status": "affected"
}
]
}Microsoft Exchange Server 2016 Cumulative Update 18
Vendor product
Publisher's version information
Shown as published. These rules are not interpreted as NuGet package version ranges.
{
"vendor": "Microsoft",
"product": "Microsoft Exchange Server 2016 Cumulative Update 18",
"platforms": [
"x64-based Systems"
],
"versions": [
{
"version": "15.01.0",
"lessThan": "15.01.2106.013",
"versionType": "custom",
"status": "affected"
}
]
}Microsoft Exchange Server 2016 Cumulative Update 19
Vendor product
Publisher's version information
Shown as published. These rules are not interpreted as NuGet package version ranges.
{
"vendor": "Microsoft",
"product": "Microsoft Exchange Server 2016 Cumulative Update 19",
"platforms": [
"x64-based Systems"
],
"versions": [
{
"version": "15.01.0",
"lessThan": "15.01.2176.009",
"versionType": "custom",
"status": "affected"
}
]
}Microsoft Exchange Server 2016 Cumulative Update 8
Vendor product
Publisher's version information
Shown as published. These rules are not interpreted as NuGet package version ranges.
{
"vendor": "Microsoft",
"product": "Microsoft Exchange Server 2016 Cumulative Update 8",
"platforms": [
"x64-based Systems"
],
"versions": [
{
"version": "15.01.0",
"lessThan": "15.01.1415.010",
"versionType": "custom",
"status": "affected"
}
]
}Microsoft Exchange Server 2016 Cumulative Update 9
Vendor product
Publisher's version information
Shown as published. These rules are not interpreted as NuGet package version ranges.
{
"vendor": "Microsoft",
"product": "Microsoft Exchange Server 2016 Cumulative Update 9",
"platforms": [
"x64-based Systems"
],
"versions": [
{
"version": "15.01.0",
"lessThan": "15.01.1466.016",
"versionType": "custom",
"status": "affected"
}
]
}Microsoft Exchange Server 2019
Vendor product
Publisher's version information
Shown as published. These rules are not interpreted as NuGet package version ranges.
{
"vendor": "Microsoft",
"product": "Microsoft Exchange Server 2019",
"platforms": [
"x64-based Systems"
],
"versions": [
{
"version": "15.02.0",
"lessThan": "15.02.0221.018",
"versionType": "custom",
"status": "affected"
}
]
}Microsoft Exchange Server 2019 Cumulative Update 1
Vendor product
Publisher's version information
Shown as published. These rules are not interpreted as NuGet package version ranges.
{
"vendor": "Microsoft",
"product": "Microsoft Exchange Server 2019 Cumulative Update 1",
"platforms": [
"x64-based Systems"
],
"versions": [
{
"version": "15.02.0",
"lessThan": "15.01.1979.006",
"versionType": "custom",
"status": "affected"
}
]
}Microsoft Exchange Server 2019 Cumulative Update 2
Vendor product
Publisher's version information
Shown as published. These rules are not interpreted as NuGet package version ranges.
{
"vendor": "Microsoft",
"product": "Microsoft Exchange Server 2019 Cumulative Update 2",
"platforms": [
"x64-based Systems"
],
"versions": [
{
"version": "15.02.0",
"lessThan": "15.02.0397.011",
"versionType": "custom",
"status": "affected"
}
]
}Microsoft Exchange Server 2019 Cumulative Update 3
Vendor product
Publisher's version information
Shown as published. These rules are not interpreted as NuGet package version ranges.
{
"vendor": "Microsoft",
"product": "Microsoft Exchange Server 2019 Cumulative Update 3",
"platforms": [
"x64-based Systems"
],
"versions": [
{
"version": "15.02.0",
"lessThan": "15.02.0464.015",
"versionType": "custom",
"status": "affected"
}
]
}Microsoft Exchange Server 2019 Cumulative Update 4
Vendor product
Publisher's version information
Shown as published. These rules are not interpreted as NuGet package version ranges.
{
"vendor": "Microsoft",
"product": "Microsoft Exchange Server 2019 Cumulative Update 4",
"platforms": [
"x64-based Systems"
],
"versions": [
{
"version": "15.02.0",
"lessThan": "15.02.0659.012",
"versionType": "custom",
"status": "affected"
}
]
}Microsoft Exchange Server 2019 Cumulative Update 5
Vendor product
Publisher's version information
Shown as published. These rules are not interpreted as NuGet package version ranges.
{
"vendor": "Microsoft",
"product": "Microsoft Exchange Server 2019 Cumulative Update 5",
"platforms": [
"x64-based Systems"
],
"versions": [
{
"version": "15.02.0",
"lessThan": "15.02.0595.008",
"versionType": "custom",
"status": "affected"
}
]
}Microsoft Exchange Server 2019 Cumulative Update 6
Vendor product
Publisher's version information
Shown as published. These rules are not interpreted as NuGet package version ranges.
{
"vendor": "Microsoft",
"product": "Microsoft Exchange Server 2019 Cumulative Update 6",
"platforms": [
"x64-based Systems"
],
"versions": [
{
"version": "15.02.0",
"lessThan": "15.02.0529.013",
"versionType": "custom",
"status": "affected"
}
]
}Microsoft Exchange Server 2019 Cumulative Update 7
Vendor product
Publisher's version information
Shown as published. These rules are not interpreted as NuGet package version ranges.
{
"vendor": "Microsoft",
"product": "Microsoft Exchange Server 2019 Cumulative Update 7",
"platforms": [
"x64-based Systems"
],
"versions": [
{
"version": "15.02.0",
"lessThan": "15.02.0721.013",
"versionType": "custom",
"status": "affected"
}
]
}Microsoft Exchange Server 2019 Cumulative Update 8
Vendor product
Publisher's version information
Shown as published. These rules are not interpreted as NuGet package version ranges.
{
"vendor": "Microsoft",
"product": "Microsoft Exchange Server 2019 Cumulative Update 8",
"platforms": [
"x64-based Systems"
],
"versions": [
{
"version": "15.02.0",
"lessThan": "15.02.0792.010",
"versionType": "custom",
"status": "affected"
}
]
}Original source record · Cite this exact observation · Complete original publisher JSON