Is CVE-2017-11121 in the CISA KEV catalog?

No. CVE-2017-11121 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2017-11121?

CVE-2017-11121 has a CVSS v3 base score of 9.8 (CRITICAL).

What is the EPSS score for CVE-2017-11121?

CVE-2017-11121 has an EPSS score of 2.79% (85th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2017-11121?

Upgrade iphone os to 11.0 or later. Fixes are available for 2 affected products.

CVE & CISA-KEV Catalog

CVE-2017-11121

CRITICALEPSS 85th pctl

9.8

CVSS v3

NVD

Description

On Broadcom BCM4355C0 Wi-Fi chips 9.44.78.27.0.1.56 and other chips, properly crafted malicious over-the-air Fast Transition frames can potentially trigger internal Wi-Fi firmware heap and/or stack overflows, leading to denial of service or other effects, aka B-V2017061205.

CWE-119Buffer Overflow

How to fix

Remediation Available

iphone osNVD

Affected:< 11.0Fixed in:11.0CVE-2017-11121derived from NVD

tvosNVD

Affected:< 11.0Fixed in:11.0CVE-2017-11121derived 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:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Exploit Intelligence

2.79%probability of exploitation in 30 days

85thpercentile

Elevated risk: more likely to be exploited than 85% of all known CVEs.

References

Exploit2

Third-Party Advisory8

Related Vulnerabilities

Other CWE-119 (Buffer Overflow) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2023-4966	Critical	9.4	100%	KEV + Ransom	Fix
CVE-2017-11882	High	7.8	100%	KEV + Ransom	-
CVE-2020-0796	Critical	10.0	100%	KEV + Ransom	-
CVE-2008-4250	Critical	9.8	99%	KEV	-
CVE-2017-15944	Critical	9.8	98%	KEV	Fix
CVE-2015-0014	High	10.0	97%	-	-

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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 2026-05-13.