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CVE-2026-118153

Microsoft Exchange Server Denial of Service Vulnerability

7.5 High

CVE-2026-118153 is a high vulnerability (CVSS 7.5) in Microsoft Exchange Server Subscription Edition Rtm, published November 10, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.30%, the 70th percentile. No source names a fixed version.

What does this mean?
Severity
7.5 HighCVSS 3.1, CVE List
Exploit chance
1.30%EPSS, 70th percentile
Exploitation
None knownNot on CISA’s or ENISA’s lists
Fixed in
No fix listedNo source names one

Description

Inefficient algorithmic complexity in Microsoft Exchange Server allows an unauthorized attacker to deny service over a network.

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

1.30%Unchanged since Nov 11, 2026
90%50%10%1%

Discussion

Quiet in the last day.
14 days ago: 0 people13 days ago: 0 people12 days ago: 0 people11 days ago: 0 people10 days ago: 0 people9 days ago: 0 people8 days ago: 0 people7 days ago: 0 people6 days ago: 0 people5 days ago: 0 people4 days ago: 0 people3 days ago: 1 person2 days ago: 0 people1 day ago: 0 peopleLast 24 hours: 0 people

Affected products

What each source reports

CVE List Score used7.5

Microsoft Exchange Server Denial of Service Vulnerability

Inefficient algorithmic complexity in Microsoft Exchange Server allows an unauthorized attacker to deny service over a network.

Record
CVE-2026-118153
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:U/RL:O/RC:C
Weakness
CWE-407
Updated
2026-11-10
EUVDEUVD-2026-1222447.5

Inefficient algorithmic complexity in Microsoft Exchange Server allows an unauthorized attacker to deny service over a network.

Record
EUVD-2026-122244
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:U/RL:O/RC:C
Updated
2026-11-10
GitHub AdvisoriesGHSA-w29c-c742-37mr7.5

Inefficient algorithmic complexity in Microsoft Exchange Server allows an unauthorized attacker...

Inefficient algorithmic complexity in Microsoft Exchange Server allows an unauthorized attacker to deny service over a network.

Record
GHSA-w29c-c742-37mr
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-407
Updated
2026-11-10
NVD7.5

Inefficient algorithmic complexity in Microsoft Exchange Server allows an unauthorized attacker to deny service over a network.

Record
CVE-2026-118153
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-407
Updated
2026-11-10

History

History
RecordedChangedSources
publishedEUVD
publishedEUVD, NVD
aliases, referencesGitHub Advisories
cwes, references, severity, titleCVE List
first indexedEUVD

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

References

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