Is CVE-2021-30855 in the CISA KEV catalog?

No. CVE-2021-30855 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-30855?

CVE-2021-30855 has a CVSS v3 base score of 5.5 (MEDIUM).

What is the EPSS score for CVE-2021-30855?

CVE-2021-30855 has an EPSS score of 2.40% (82th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-30855?

Upgrade ipados to 14.8 or later. Fixes are available for 6 affected products.

CVE & CISA-KEV Catalog

CVE-2021-30855

MEDIUMEPSS 82th pctl

5.5

CVSS v3

NVD

Description

A validation issue existed in the handling of symlinks. This issue was addressed with improved validation of symlinks. This issue is fixed in Security Update 2021-005 Catalina, iOS 14.8 and iPadOS 14.8, iOS 15 and iPadOS 15, watchOS 8, macOS Big Sur 11.6. An application may be able to access restricted files.

CWE-59Link Following

How to fix

Remediation Available

ipadosNVD

Affected:< 14.8Fixed in:14.8CVE-2021-30855derived from NVD

iphone osNVD

Affected:< 14.8Fixed in:14.8CVE-2021-30855derived from NVD

mac os xNVD

Affected:< 10.15.7Fixed in:10.15.7CVE-2021-30855derived from NVD

macosNVD

Affected:< 11.6Fixed in:11.6CVE-2021-30855derived from NVD

tvosNVD

Affected:< 15.0Fixed in:15.0CVE-2021-30855derived from NVD

watchosNVD

Affected:< 8.0Fixed in:8.0CVE-2021-30855derived 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 VectorLocal

Attack ComplexityLow

Privileges RequiredNone

User InteractionRequired

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityNone

AvailabilityNone

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

Exploit Intelligence

2.40%probability of exploitation in 30 days

82ndpercentile

Elevated risk: more likely to be exploited than 82% of all known CVEs.

References

Other references6

Related Vulnerabilities

Other CWE-59 (Link Following) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2022-30333	High	7.5	99%	KEV + Ransom	Fix
CVE-2021-21300	High	8.0	89%	-	Fix
CVE-2021-32610	High	7.1	73%	-	Fix
CVE-2020-36193	High	7.5	71%	KEV	Fix
CVE-2023-40028	Medium	4.9	58%	-	Fix
CVE-2020-0787	High	7.8	43%	KEV + Ransom	-

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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.