boxscore/security
PRODUCT · referenceProducts · latest edition

Reference page — cumulative record through Wednesday, October 7, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

Microsoft Exchange Server 2013 Cumulative Update 23

Product reference — Microsoft Exchange Server 2013 Cumulative Update 23 by Microsoft · sector: Operating Systems & Platforms. Cumulative disclosure record for this product across the archive.

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Product totals

Disclosures & known-exploited
All-timeYTD
CVEs241
KEV entries131
Rate & severity
KEV/100Med CVSSMed EPSSCHML
54.28.0.796751540

KEV/100 = KEV entries ÷ CVEs × 100. Med CVSS / Med EPSS are medians over this product's disclosures. C/H/M/L = disclosures by CVSS severity band.

Monthly disclosures

Trend (by first-seen month, full archive): ▄▁▂▁▃▁▁▁█▁▂▁▁▁▁▁▁▁▁▃▃▁▂▃▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▂▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▂▁▁▁▁▁▁

Last 12 months (new CVEs by first-seen day)
MonthNew CVEs
2025-110
2025-120
2026-010
2026-020
2026-030
2026-041
2026-050
2026-060
2026-070
2026-080
2026-090
2026-100

Notable CVEs

Ranked by the published formula: KEV → EPSS → CVSS → CVE ID.

Notable (ranked)
CVECVSSEPSS %ileSeverityKEVFirst seen
CVE-2021-344739.1100.0CRITICALYES2021-11-03
CVE-2021-268559.1100.0CRITICALYES2021-11-03
CVE-2021-345239.0100.0CRITICALYES2021-11-03
CVE-2022-410828.0100.0HIGHYES2022-10-03
CVE-2022-410408.8100.0HIGHYES2022-10-03
CVE-2021-270657.8100.0HIGHYES2021-11-03
CVE-2021-312076.6100.0MEDIUMYES2021-05-11
CVE-2021-337667.399.9HIGHYES2022-01-18
CVE-2021-268577.899.9HIGHYES2021-11-03
CVE-2021-268587.899.8HIGHYES2021-11-03
CVE-2022-410808.899.5HIGHYES2023-01-10
CVE-2023-215298.899.1HIGHYES2026-04-13
CVE-2021-311967.299.0HIGHYES2024-08-21
CVE-2021-413496.599.8MEDIUM—2021-11-10
CVE-2023-217078.899.6HIGH—2023-02-14

Recent CVEs

Most recently seen
CVECVSSEPSS %ileSeverityKEVFirst seen
CVE-2023-215298.899.1HIGHYES2026-04-13
CVE-2021-311967.299.0HIGHYES2024-08-21
CVE-2023-217078.899.6HIGH—2023-02-14
CVE-2023-217068.890.4HIGH—2023-02-14
CVE-2022-410808.899.5HIGHYES2023-01-10
CVE-2022-410798.056.1HIGH—2022-11-09
CVE-2022-410788.056.1HIGH—2022-11-09
CVE-2022-410408.8100.0HIGHYES2022-10-03
CVE-2022-410828.0100.0HIGHYES2022-10-03
CVE-2021-337667.399.9HIGHYES2022-01-18
CVE-2021-423056.594.5MEDIUM—2021-11-10
CVE-2021-413496.599.8MEDIUM—2021-11-10
CVE-2021-270657.8100.0HIGHYES2021-11-03
CVE-2021-268587.899.8HIGHYES2021-11-03
CVE-2021-268577.899.9HIGHYES2021-11-03

KEV entries

CISA Known Exploited Vulnerabilities (newest addition first)
CVEKEV addedCVSSEPSS %ileSeverity
CVE-2023-215292026-04-138.899.1HIGH
CVE-2021-311962024-08-217.299.0HIGH
CVE-2022-410802023-01-108.899.5HIGH
CVE-2022-410402022-09-308.8100.0HIGH
CVE-2022-410822022-09-308.0100.0HIGH
CVE-2021-337662022-01-187.399.9HIGH
CVE-2021-270652021-11-037.8100.0HIGH
CVE-2021-268582021-11-037.899.8HIGH
CVE-2021-268572021-11-037.899.9HIGH
CVE-2021-268552021-11-039.1100.0CRITICAL
CVE-2021-312072021-11-036.6100.0MEDIUM
CVE-2021-345232021-11-039.0100.0CRITICAL
CVE-2021-344732021-11-039.1100.0CRITICAL

Related

Vendor: Microsoft — all products and the full vendor record.

Methodology

A product is a (vendor, product) pair as named in the affected-product data. Rate statistics are arithmetic over published figures. Counts key to first-seen day. Raw counts are not comparable across products; this is a reference page assembled from the public record, not a ranking by our judgment.

Sources. CVE Program (cvelistV5), NVD (NIST), CISA KEV, FIRST EPSS.