Is CVE-2009-2055 in the CISA KEV catalog?

Yes. CVE-2009-2055 is on the CISA Known Exploited Vulnerabilities list, added 2022-03-25.

What is the CVSS severity of CVE-2009-2055?

CVE-2009-2055 has a CVSS v3 base score of 5.9 (MEDIUM).

What is the EPSS score for CVE-2009-2055?

CVE-2009-2055 has an EPSS score of 3.33% (87th percentile), estimating the probability of exploitation in the next 30 days.

CVE & CISA-KEV Catalog

CVE-2009-2055

MEDIUMCISA KEVEPSS 87th pctl

5.9

CVSS v3

NVD

Description

Cisco IOS XR 3.4.0 through 3.8.1 allows remote attackers to cause a denial of service (session reset) via a BGP UPDATE message with an invalid attribute, as demonstrated in the wild on 17 August 2009.

CWE-20Improper Input Validation

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityHigh

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityHigh

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

Exploit Intelligence

3.33%probability of exploitation in 30 days

87thpercentile

Elevated risk: more likely to be exploited than 87% of all known CVEs.

Known Exploited Vulnerability (CISA KEV)

Cisco IOS XR Border Gateway Protocol (BGP) Denial-of-Service Vulnerability

Cisco IOS XR,when BGP is the configured routing feature, allows remote attackers to cause a denial-of-service (DoS).

Apply updates per vendor instructions.

Remediation due: 2022-04-15

References

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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 2026-04-22.