Is CVE-2023-20049 in the CISA KEV catalog?

No. CVE-2023-20049 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2023-20049?

CVE-2023-20049 has a CVSS v3 base score of 8.6 (HIGH).

What is the EPSS score for CVE-2023-20049?

CVE-2023-20049 has an EPSS score of 1.05% (60th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2023-20049?

Upgrade ios xr to 7.6.2 or later.

CVE & CISA-KEV Catalog

CVE-2023-20049

HIGH

8.6

CVSS v3

NVD

Description

A vulnerability in the bidirectional forwarding detection (BFD) hardware offload feature of Cisco IOS XR Software for Cisco ASR 9000 Series Aggregation Services Routers, ASR 9902 Compact High-Performance Routers, and ASR 9903 Compact High-Performance Routers could allow an unauthenticated, remote attacker to cause a line card to reset, resulting in a denial of service (DoS) condition. This vulnerability is due to the incorrect handling of malformed BFD packets that are received on line cards where the BFD hardware offload feature is enabled. An attacker could exploit this vulnerability by sending a crafted IPv4 BFD packet to an affected device. A successful exploit could allow the attacker to cause line card exceptions or a hard reset, resulting in loss of traffic over that line card while the line card reloads.

CWE-805 CWE-119Buffer Overflow

How to fix

Remediation Available

ios xrNVD

Affected:>= 7.6, < 7.6.2Fixed in:7.6.2CVE-2023-20049derived 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

1.05%probability of exploitation in 30 days

60thpercentile

Moderate risk: more likely to be exploited than 60% of all known CVEs.

References

Vendor Advisory1

sec.cloudapps.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.