Is CVE-2021-1223 in the CISA KEV catalog?

No. CVE-2021-1223 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-1223?

CVE-2021-1223 has a CVSS v3 base score of 7.5 (HIGH).

What is the EPSS score for CVE-2021-1223?

CVE-2021-1223 has an EPSS score of 1.98% (78th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-1223?

Upgrade firepower threat defense to 6.7.0 or later. Fixes are available for 3 affected products.

CVE & CISA-KEV Catalog

CVE-2021-1223

HIGHEPSS 78th pctl

7.5

CVSS v3

NVD

Description

Multiple Cisco products are affected by a vulnerability in the Snort detection engine that could allow an unauthenticated, remote attacker to bypass a configured file policy for HTTP. The vulnerability is due to incorrect handling of an HTTP range header. An attacker could exploit this vulnerability by sending crafted HTTP packets through an affected device. A successful exploit could allow the attacker to bypass configured file policy for HTTP packets and deliver a malicious payload.

CWE-693Protection Mechanism Failure

How to fix

Remediation Available

firepower threat defenseNVD

Affected:< 6.7.0Fixed in:6.7.0CVE-2021-1223derived from NVD

ios xeNVD

Affected:< 17.4.1Fixed in:17.4.1CVE-2021-1223derived from NVD

snortNVD

Affected:< 2.9.17Fixed in:2.9.17CVE-2021-1223derived 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

ConfidentialityNone

IntegrityHigh

AvailabilityNone

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

Exploit Intelligence

1.98%probability of exploitation in 30 days

78thpercentile

Elevated risk: more likely to be exploited than 78% of all known CVEs.

References

Vendor Advisory1

tools.cisco.com

Other references2

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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 2024-11-26.