Is CVE-2021-1495 in the CISA KEV catalog?

No. CVE-2021-1495 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-1495?

CVE-2021-1495 has a CVSS v3 base score of 5.8 (MEDIUM).

What is the EPSS score for CVE-2021-1495?

CVE-2021-1495 has an EPSS score of 1.71% (75th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-1495?

Upgrade firepower threat defense to 6.7.0.2 or later. Fixes are available for 3 affected products.

CVE & CISA-KEV Catalog

CVE-2021-1495

MEDIUMEPSS 75th pctl

5.8

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 specific HTTP header parameters. An attacker could exploit this vulnerability by sending crafted HTTP packets through an affected device. A successful exploit could allow the attacker to bypass a configured file policy for HTTP packets and deliver a malicious payload.

CWE-755

How to fix

Remediation Available

firepower threat defenseNVD

Affected:>= 6.7.0, < 6.7.0.2Fixed in:6.7.0.2CVE-2021-1495derived from NVD

ios xeNVD

Affected:>= 16.12, < 16.12.5Fixed in:16.12.5CVE-2021-1495derived from NVD

Affected:>= 17.4, < 17.4.1Fixed in:17.4.1CVE-2021-1495derived from NVD

snortNVD

Affected:< 2.9.17.1Fixed in:2.9.17.1CVE-2021-1495derived 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

IntegrityLow

AvailabilityNone

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

Exploit Intelligence

1.71%probability of exploitation in 30 days

75thpercentile

Elevated risk: more likely to be exploited than 75% of all known CVEs.

References

Vendor Advisory1

tools.cisco.com

Other references2

Related Vulnerabilities

Other CWE-755 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2017-5638	Critical	9.8	100%	KEV + Ransom	Fix
CVE-2020-7247	Critical	9.8	99%	KEV	Fix
CVE-2023-36933	High	7.5	72%	-	Fix
CVE-2018-0934	High	7.5	66%	-	Fix
CVE-2019-14287	High	8.8	64%	-	Fix
CVE-2019-12815	Critical	9.8	58%	-	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.