Is CVE-2021-34718 in the CISA KEV catalog?

No. CVE-2021-34718 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-34718?

CVE-2021-34718 has a CVSS v3 base score of 8.1 (HIGH).

What is the EPSS score for CVE-2021-34718?

CVE-2021-34718 has an EPSS score of 1.58% (73th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-34718?

Upgrade ios xr to 7.4.1 or later.

CVE & CISA-KEV Catalog

CVE-2021-34718

HIGHEPSS 73th pctl

8.1

CVSS v3

NVD

Description

A vulnerability in the SSH Server process of Cisco IOS XR Software could allow an authenticated, remote attacker to overwrite and read arbitrary files on the local device. This vulnerability is due to insufficient input validation of arguments that are supplied by the user for a specific file transfer method. An attacker with lower-level privileges could exploit this vulnerability by specifying Secure Copy Protocol (SCP) parameters when authenticating to a device. A successful exploit could allow the attacker to elevate their privileges and retrieve and upload files on a device that they should not have access to.

CWE-88

How to fix

Remediation Available

ios xrNVD

Affected:>= 7.4.0, < 7.4.1Fixed in:7.4.1CVE-2021-34718derived 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

ConfidentialityHigh

IntegrityHigh

AvailabilityNone

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

Exploit Intelligence

1.58%probability of exploitation in 30 days

73rdpercentile

Elevated risk: more likely to be exploited than 73% of all known CVEs.

References

Vendor Advisory1

tools.cisco.com

Related Vulnerabilities

Other CWE-88 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2016-10033	Critical	9.8	100%	KEV	Fix
CVE-2022-36804	High	8.8	99%	KEV	Fix
CVE-2026-24061	Critical	9.8	99%	KEV	Fix
CVE-2007-0882	High	10.0	98%	-	-
CVE-2018-17456	Critical	9.8	97%	-	Fix
CVE-2018-19518	High	7.5	95%	-	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.