Vulnerabilities/CVE-2023-21557

CVE-2023-21557: Windows Lightweight Directory Access Protocol (LDAP) Denial of Service Vulnerability

SSVC · Estimated by CveMateAttendEscalate and remediate ahead of routine patching. CISA has no entry yet, so CveMate computed this from CVSS and exploit data. It is replaced when CISA publishes.

ExploitationNone (derived)

AutomatableYes (derived)

Technical impactPartial (derived)

Mission & well-beingHigh (assumed)

Source: CveMate estimate, same decision tree as CISA.CISA publishes the first three inputs. Mission & well-being depends on your environment, so it is assumed at its highest: the decision is a worst case.

Modified

Published 10-01-2023Last modified 01-01-2025

On this page

Summary Timeline Description CVSS metrics EPSS trend Known exploited Public exploits Weaknesses Affected systems References

Key information

Published10-01-2023

Modified01-01-2025

SourceCVE.org

CVSS7.5

EPSS2.08%

KEV0

Exploits0

Vulnerability summary

CVE-2023-21557 is a high (CVSS 7.5) Integer Overflow or Wraparound vulnerability in microsoft windows_10_1607. EPSS estimates a 2.08% chance of exploitation in the next 30 days, higher than 81.3% of scored vulnerabilities.

Overall risk

30/100

0100

Medium · default modelHow is this calculated?

SSVC · Estimated by CveMateAttendEscalate and remediate ahead of routine patching. CISA has no entry yet, so CveMate computed this from CVSS and exploit data. It is replaced when CISA publishes.

ExploitationNone (derived)

AutomatableYes (derived)

Technical impactPartial (derived)

Mission & well-beingHigh (assumed)

CVSS score

7.5/10

010

High · v3.1 (CVE.org)

EPSS score

2.08%

0%100%

Low · +0.05 pp in 30 days

KEVNot listedNot listed by any tracked catalog.

RansomwareNot flaggedNo ransomware use recorded.

Public exploits0No public exploits recorded

Timeline

10-01-2023
PublishedVulnerability first disclosed.
01-01-2025
Last modifiedVulnerability information updated.

Description

Windows Lightweight Directory Access Protocol (LDAP) Denial of Service Vulnerability

CVSS metrics

2 scores · 2 sources · 1 version

v3.17.5

High 7.5Preferred score · CVE.org (CNA)

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C

SourcesAll 2 agree

NVDNIST7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS trend

Probability

2.08%

Chance of exploitation in the next 30 days

Percentile

81%

Versus all other CVEs

30-day change

Increase +0.05 pp

From 2.03% on 22-09-2026

100%75%50%25%0%

22-09-202622-10-2026

Known exploited

Compare KEV catalogs

CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

CWE-190Integer Overflow or WraparoundThe product performs a calculation that can produce an integer overflow or wraparound when the logic assumes that the resulting value will always be larger than the original value. This occurs when an integer value is incremented to a value that is too large to store in the associated representation. When this occurs, the value may become a very small or negative number.
CWE-400Uncontrolled Resource ConsumptionThe product does not properly control the allocation and maintenance of a limited resource.

Affected systems

Microsoft34 products

windows_10_1607na
windows_10_1809na
windows_10_20h2na
windows_10_21h2na
windows_10_22h2na

windows 10 version 1507≥ 10.0.10240.0, < 10.0.10240.19685
windows 10 version 1607≥ 10.0.14393.0, < 10.0.14393.5648
windows 10 version 1809≥ 10.0.17763.0, < 10.0.17763.3887 | ≥ 10.0.0, < 10.0.17763.3887
windows 10 version 20h2≥ 10.0.0, < 10.0.19042.2486
windows 10 version 21h2≥ 10.0.19043.0, < 10.0.19044.2486
windows 10 version 22h2≥ 10.0.19045.0, < 10.0.19045.2486
windows_11_21h2na
windows_11_22h2na
windows 11 version 21h2≥ 10.0.0, < 10.0.22000.1455
windows 11 version 22h2≥ 10.0.22621.0, < 10.0.22621.1105
windows_7≥ 6.1.0, < 6.1.7601.26321 | na
windows 7 service pack 1≥ 6.1.0, < 6.1.7601.26321
windows_8.1≥ 6.3.0, < 6.3.9600.20778 | na
windows_rt_8.1na
windows_server_2008na | r2:sp1
windows server 2008 service pack 2≥ 6.0.6003.0, < 6.0.6003.21872
windows server 2008 r2 service pack 1≥ 6.1.7601.0, < 6.1.7601.26321
windows server 2008 r2 service pack 1 (server core installation)≥ 6.1.7601.0, < 6.1.7601.26321
windows server 2008 service pack 2≥ 6.0.6003.0, < 6.0.6003.21872
windows server 2008 service pack 2 (server core installation)≥ 6.0.6003.0, < 6.0.6003.21872
windows_server_2012≥ 6.2.9200.0, < 6.2.9200.24075 | na | r2
windows server 2012 r2≥ 6.3.9600.0, < 6.3.9600.20778
windows server 2012 r2 (server core installation)≥ 6.3.9600.0, < 6.3.9600.20778
windows server 2012 (server core installation)≥ 6.2.9200.0, < 6.2.9200.24075
windows_server_2016≥ 10.0.14393.0, < 10.0.14393.5648 | na
windows server 2016 (server core installation)≥ 10.0.14393.0, < 10.0.14393.5648
windows_server_2019≥ 10.0.17763.0, < 10.0.17763.3887 | na
windows server 2019 (server core installation)≥ 10.0.17763.0, < 10.0.17763.3887
windows_server_2022≥ 10.0.20348.0, < 10.0.20348.1487 | na

Show all 34Show top 5

1 vendor · 34 products

References

1 links

msrc.microsoft.com/update-guide/vulnerability/CVE-2023-21557Vendor Advisory

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