CVE-2023-40447

HIGHNVD 8.88.8—
EchelonGraph scoreMEDIUM confidence

Score 8.8 from GitHub Security Advisory (severity: HIGH) published 2023-10-25. NVD baseline CVSS 8.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
8.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 2%CVSS: 8.8Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

The issue was addressed with improved memory handling. This issue is fixed in iOS 17.1 and iPadOS 17.1, watchOS 10.1, iOS 16.7.2 and iPadOS 16.7.2, macOS Sonoma 14.1, Safari 17.1, tvOS 17.1. Processing web content may lead to arbitrary code execution.

CVSS v3
8.8
EG Score
8.8(medium)
EG Risk
45(Track)
EG Risk 45/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity88% × 45%
Exploitation2% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
2%
EPSS %ILE
72%
KEV
Not listed

Published

October 25, 2023

Last Modified

November 21, 2024

Advisory Details (10)

Auto-updated Aug 6, 2026
No patch confirmed yet.
generic

About the security content of Safari 17.1 - Apple Support

https://support.apple.com/en-us/HT213986
generic

About the security content of macOS Sonoma 14.1 - Apple Support

https://support.apple.com/en-us/HT213984
generic

About the security content of iOS 17.1 and iPadOS 17.1 - Apple Support

https://support.apple.com/en-us/HT213982
generic

About the security content of iOS 16.7.2 and iPadOS 16.7.2 - Apple Support

https://support.apple.com/en-us/HT213981
generic

Full Disclosure: APPLE-SA-10-25-2023-9 Safari 17.1

http://seclists.org/fulldisclosure/2023/Oct/27
generic

Full Disclosure: APPLE-SA-10-25-2023-8 watchOS 10.1

http://seclists.org/fulldisclosure/2023/Oct/25
generic

Full Disclosure: APPLE-SA-10-25-2023-4 macOS Sonoma 14.1

http://seclists.org/fulldisclosure/2023/Oct/24
generic

Full Disclosure: APPLE-SA-10-25-2023-2 iOS 16.7.2 and iPadOS 16.7.2

http://seclists.org/fulldisclosure/2023/Oct/23
generic

Full Disclosure: APPLE-SA-10-25-2023-7 tvOS 17.1

http://seclists.org/fulldisclosure/2023/Oct/22
generic

Full Disclosure: APPLE-SA-10-25-2023-1 iOS 17.1 and iPadOS 17.1

http://seclists.org/fulldisclosure/2023/Oct/19

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 7× in last 7d / 44× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 131 total refreshes for this CVE.

  1. 2026-08-09 13:44 UTCEPSS rescore
  2. 2026-08-09 13:44 UTCEPSS rescore
  3. 2026-08-08 16:35 UTCEPSS rescore
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  1. 2026-07-23 02:25 UTCEG score recompute
  2. 2026-07-22 23:12 UTCEG score recompute
  3. 2026-07-22 14:06 UTCEPSS rescore
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  6. 2026-07-20 17:06 UTCEPSS rescore
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  20. 2026-07-12 05:45 UTCEPSS rescore
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  22. 2026-07-11 08:26 UTCEPSS rescore
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  24. 2026-07-09 19:08 UTCEPSS rescore
  25. 2026-07-08 15:13 UTCEPSS rescore
  26. 2026-07-07 13:44 UTCEPSS rescore
  27. 2026-07-06 16:26 UTCEPSS rescore
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  40. 2026-06-27 03:07 UTCEPSS rescore
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  42. 2026-06-25 13:48 UTCEPSS rescore
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  46. 2026-06-23 21:31 UTCEPSS rescore
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  48. 2026-06-22 14:24 UTCEPSS rescore
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  50. 2026-06-21 14:55 UTCEPSS rescore
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  52. 2026-06-21 01:58 UTCEPSS rescore
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  54. 2026-06-19 19:24 UTCEPSS rescore
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  56. 2026-06-18 17:51 UTCEPSS rescore
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  70. 2026-06-10 22:17 UTCEPSS rescore
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  73. 2026-06-08 14:16 UTCEPSS rescore
  74. 2026-06-08 14:16 UTCEPSS rescore
  75. 2026-06-07 15:23 UTCEPSS rescore

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Frequently asked(5)

What is CVE-2023-40447?
CVE-2023-40447 is a high vulnerability published on October 25, 2023. The issue was addressed with improved memory handling. This issue is fixed in iOS 17.1 and iPadOS 17.1, watchOS 10.1, iOS 16.7.2 and iPadOS 16.7.2, macOS Sonoma 14.1, Safari 17.1, tvOS 17.1. Processing web content may lead to arbitrary code execution.
When was CVE-2023-40447 disclosed?
CVE-2023-40447 was first published in the National Vulnerability Database on October 25, 2023, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2023-40447 actively exploited?
CVE-2023-40447 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 2% probability of exploitation in the next 30 days, which ranks it in the top 27.8% of all scored CVEs.
What is the CVSS score of CVE-2023-40447?
CVE-2023-40447 has a CVSS v3 base score of 8.8 (NVD).
How do I remediate CVE-2023-40447?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2023-40447, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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