Is CVE-2021-1864 in the CISA KEV catalog?

No. CVE-2021-1864 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-1864?

CVE-2021-1864 has a CVSS v3 base score of 9.8 (CRITICAL).

What is the EPSS score for CVE-2021-1864?

CVE-2021-1864 has an EPSS score of 2.15% (80th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-1864?

Upgrade ipados to 14.5 or later. Fixes are available for 4 affected products.

CVE & CISA-KEV Catalog

CVE-2021-1864

CRITICALEPSS 80th pctl

9.8

CVSS v3

NVD

Description

A use after free issue was addressed with improved memory management. This issue is fixed in iOS 14.5 and iPadOS 14.5, watchOS 7.4, tvOS 14.5. An attacker with JavaScript execution may be able to execute arbitrary code.

CWE-416Use After Free

How to fix

Remediation Available

ipadosNVD

Affected:< 14.5Fixed in:14.5CVE-2021-1864derived from NVD

iphone osNVD

Affected:< 14.5Fixed in:14.5CVE-2021-1864derived from NVD

tvosNVD

Affected:< 14.5Fixed in:14.5CVE-2021-1864derived from NVD

watchosNVD

Affected:< 7.4Fixed in:7.4CVE-2021-1864derived from NVD

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

2.15%probability of exploitation in 30 days

80thpercentile

Elevated risk: more likely to be exploited than 80% of all known CVEs.

References

Vendor Advisory3

Related Vulnerabilities

Other CWE-416 (Use After Free) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2019-0708	Critical	9.8	100%	KEV + Ransom	-
CVE-2021-31166	Critical	9.8	100%	KEV	Fix
CVE-2015-5119	Critical	9.8	99%	KEV	-
CVE-2010-3962	High	8.1	97%	KEV	-
CVE-2015-0313	Critical	9.8	96%	KEV	Fix
CVE-2017-9798	High	7.5	95%	-	Fix

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.