Is CVE-2021-27791 in the CISA KEV catalog?

No. CVE-2021-27791 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-27791?

CVE-2021-27791 has a CVSS v3 base score of 5.4 (MEDIUM).

What is the EPSS score for CVE-2021-27791?

CVE-2021-27791 has an EPSS score of 0.60% (45th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-27791?

Upgrade fabric operating system to 9.0.1a or later.

CVE & CISA-KEV Catalog

CVE-2021-27791

MEDIUM

5.4

CVSS v3

NVD

Description

The function that is used to parse the Authentication header in Brocade Fabric OS Web application service before Brocade Fabric OS v9.0.1a and v8.2.3a fails to properly process a malformed authentication header from the client, resulting in reading memory addresses outside the intended range. An unauthenticated attacker could discover a request, which could bypass the authentication process.

CWE-125Out-of-bounds Read

How to fix

Remediation Available

fabric operating systemNVD

Affected:>= 9.0.0, < 9.0.1aFixed in:9.0.1aCVE-2021-27791derived 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 RequiredLow

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityLow

IntegrityLow

AvailabilityNone

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

Exploit Intelligence

0.60%probability of exploitation in 30 days

45thpercentile

Moderate risk: more likely to be exploited than 45% of all known CVEs.

References

Vendor Advisory1

broadcom.com

Third-Party Advisory1

security.netapp.com

Related Vulnerabilities

Other CWE-125 (Out-of-bounds Read) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2014-0160	High	7.5	100%	KEV	Fix
CVE-2025-5777	High	7.5	100%	KEV + Ransom	Fix
CVE-2021-4034	High	7.8	95%	KEV	Fix
CVE-2023-21769	High	7.5	92%	-	Fix
CVE-2023-49285	High	8.6	89%	-	Fix
CVE-2020-8794	Critical	9.8	89%	-	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.