Is CVE-2021-1611 in the CISA KEV catalog?

No. CVE-2021-1611 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-1611?

CVE-2021-1611 has a CVSS v3 base score of 8.6 (HIGH).

What is the EPSS score for CVE-2021-1611?

CVE-2021-1611 has an EPSS score of 1.29% (67th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-1611?

Upgrade ios xe to 17.3.1 or later.

CVE & CISA-KEV Catalog

CVE-2021-1611

HIGH

8.6

CVSS v3

NVD

Description

A vulnerability in Ethernet over GRE (EoGRE) packet processing of Cisco IOS XE Wireless Controller Software for the Cisco Catalyst 9800 Family Wireless Controller, Embedded Wireless Controller, and Embedded Wireless on Catalyst 9000 Series Switches could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. This vulnerability is due to improper processing of malformed EoGRE packets. An attacker could exploit this vulnerability by sending malicious packets to the affected device. A successful exploit could allow the attacker to cause the device to reload, resulting in a DoS condition.

CWE-399Resource Management Errors

How to fix

Remediation Available

ios xeNVD

Affected:< 17.3.1Fixed in:17.3.1CVE-2021-1611derived 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

ScopeChanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityHigh

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

Exploit Intelligence

1.29%probability of exploitation in 30 days

67thpercentile

Moderate risk: more likely to be exploited than 67% of all known CVEs.

References

Patch1

tools.cisco.com

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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.