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CVE-2020-0836

Windows DNS Denial of Service Vulnerability

7.5 High

CVE-2020-0836 is a high vulnerability (CVSS 7.5) in Microsoft Windows Server 2008 Service Pack 2, published September 11, 2020. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 5.05%, the 92nd percentile. No source names a fixed version.

What does this mean?
Severity
7.5 HighCVSS 3.1, CVE List
Exploit chance
5.05%EPSS, 92nd percentile
Exploitation
None knownNot on CISA’s or ENISA’s lists
Fixed in
No fix listedNo source names one

Description

<p>A denial of service vulnerability exists in Windows DNS when it fails to properly handle queries. An attacker who successfully exploited this vulnerability could cause the DNS service to become nonresponsive.</p> <p>To exploit the vulnerability, an authenticated attacker could send malicious DNS queries to a target, resulting in a denial of service.</p> <p>The update addresses the vulnerability by correcting how Windows DNS processes queries.</p>

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
None
User interaction
None

What an attacker can affect

Confidentiality
None
Integrity
None
Availability
High

Exploit likelihood

5.05%Down 0.6 points since Apr 14, 2021
90%50%10%1%

Affected products

Show 5 moreShow less

What each source reports

CVE List Score used7.5

Windows DNS Denial of Service Vulnerability

<p>A denial of service vulnerability exists in Windows DNS when it fails to properly handle queries. An attacker who successfully exploited this vulnerability could cause the DNS service to become nonresponsive.</p> <p>To exploit the vulnerability, an authenticated attacker could send malicious DNS queries to a target, resulting in a denial of service.</p> <p>The update addresses the vulnerability by correcting how Windows DNS processes queries.</p>

Record
CVE-2020-0836
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C
Updated
2026-11-02
EUVDEUVD-2020-23087.5

<p>A denial of service vulnerability exists in Windows DNS when it fails to properly handle queries. An attacker who successfully exploited this vulnerability could cause the DNS service to become nonresponsive.</p> <p>To exploit the vulnerability, an authenticated attacker could send malicious DNS queries to a target, resulting in a denial of service.</p> <p>The update addresses the vulnerability by correcting how Windows DNS processes queries.</p>

Record
EUVD-2020-2308
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C
Updated
2026-11-03
GitHub AdvisoriesGHSA-pf2q-6q6p-25p97.5

A denial of service vulnerability exists in Windows DNS when it fails to properly handle queries,...

A denial of service vulnerability exists in Windows DNS when it fails to properly handle queries, aka 'Windows DNS Denial of Service Vulnerability'. This CVE ID is unique from CVE-2020-1228.

Record
GHSA-pf2q-6q6p-25p9
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness
CWE-20
Updated
2026-11-02
NVD7.5

<p>A denial of service vulnerability exists in Windows DNS when it fails to properly handle queries. An attacker who successfully exploited this vulnerability could cause the DNS service to become nonresponsive.</p> <p>To exploit the vulnerability, an authenticated attacker could send malicious DNS queries to a target, resulting in a denial of service.</p> <p>The update addresses the vulnerability by correcting how Windows DNS processes queries.</p>

Record
CVE-2020-0836
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS 2.0
5.0 MediumAV:N/AC:L/Au:N/C:N/I:N/A:P
Updated
2026-11-02

History

History
RecordedChangedSources
facts
aliasesEUVD
first indexedCVE List, GitHub Advisories, NVD

Dates are when Every CVE recorded each change. Upstream dates may differ.

References

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