CASCACascade Atlas

Evidence dossier

CVE-2009-2055

CVE-2009-2055

54.4–73.4Priority evidence range
As known Jul 19, 2026, 5:00 AM UTCgen-56ccdaf9

Normalized restatement

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.

State
PUBLISHED
Published
Aug 19, 2009
Updated
Jan 12, 2026
Evidence coverage
72%
CISA KEVCatalog member

Apply updates per vendor instructions.

FIRST EPSS3.33%

2026-07-18 · v2026.06.15 · percentile 87.2%

Source stateConflict visible

Distinct CVSS assessments remain side by side; none are averaged.

Source comparison

Who said what

CISA-ADPindependent enrichment
container

CISA ADP Vulnrichment

ciscooriginal assertion
container

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.

CVEderivative copy
container

CVE Program Container

CISA KEVoriginal assertion
observed_exploitation

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

FIRST EPSSoriginal assertion
model_probability

Probability 0.033260000000; percentile 0.872450000000

Applicability

Cited product scope

Trace impact →
n/an/a
[{"status": "affected", "version": "n/a"}]unknown
Unknown vendorUnknown product
cpe:2.3:o:cisco:ios_xr:3.4:*:*:*:*:*:*:*supported
Unknown vendorUnknown product
cpe:2.3:o:cisco:ios_xr:3.4.0:*:*:*:*:*:*:*supported
Unknown vendorUnknown product
cpe:2.3:o:cisco:ios_xr:3.4.1:*:*:*:*:*:*:*supported
Unknown vendorUnknown product
cpe:2.3:o:cisco:ios_xr:3.4.2:*:*:*:*:*:*:*supported
Unknown vendorUnknown product
cpe:2.3:o:cisco:ios_xr:3.4.3:*:*:*:*:*:*:*supported
Unknown vendorUnknown product
cpe:2.3:o:cisco:ios_xr:3.5:*:*:*:*:*:*:*supported
Unknown vendorUnknown product
cpe:2.3:o:cisco:ios_xr:3.5.2:*:*:*:*:*:*:*supported
Unknown vendorUnknown product
cpe:2.3:o:cisco:ios_xr:3.5.3:*:*:*:*:*:*:*supported
Unknown vendorUnknown product
cpe:2.3:o:cisco:ios_xr:3.5.4:*:*:*:*:*:*:*supported
Unknown vendorUnknown product
cpe:2.3:o:cisco:ios_xr:3.6.0:*:*:*:*:*:*:*supported
Unknown vendorUnknown product
cpe:2.3:o:cisco:ios_xr:3.6.1:*:*:*:*:*:*:*supported
Unknown vendorUnknown product
cpe:2.3:o:cisco:ios_xr:3.6.2:*:*:*:*:*:*:*supported
Unknown vendorUnknown product
cpe:2.3:o:cisco:ios_xr:3.6.3:*:*:*:*:*:*:*supported
Unknown vendorUnknown product
cpe:2.3:o:cisco:ios_xr:3.7.0:*:*:*:*:*:*:*supported
Unknown vendorUnknown product
cpe:2.3:o:cisco:ios_xr:3.7.1:*:*:*:*:*:*:*supported
Unknown vendorUnknown product
cpe:2.3:o:cisco:ios_xr:3.7.2:*:*:*:*:*:*:*supported
Unknown vendorUnknown product
cpe:2.3:o:cisco:ios_xr:3.7.3:*:*:*:*:*:*:*supported
Unknown vendorUnknown product
cpe:2.3:o:cisco:ios_xr:3.8.0:*:*:*:*:*:*:*supported
Unknown vendorUnknown product
cpe:2.3:o:cisco:ios_xr:3.8.1:*:*:*:*:*:*:*supported

Assessments

CVSS by origin

4.3
nvd@nist.govCVSS 2.0 · role PrimaryAV:N/AC:M/Au:N/C:N/I:N/A:P
5.9
134c704f-9b21-4f2e-91b3-4a467353bcc0CVSS 3.1 · role SecondaryCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
5.9
CISA-ADPCVSS 3.1 · role unknownCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

Limitations and unknowns

  • KEV membership is authoritative for the catalog, not proof of exposure in any environment.
  • EPSS is a dated model probability and not an individual-environment prediction.
  • Affected or fixed status applies only to the exact cited product and version scope; unresolved scope remains unknown.
  • NVD-carried upstream facts remain derivative and are not independent corroboration.
  • Only NVD metrics validated under the generation-bound calculator are Public Priority eligible; direct CVE record metrics remain display-only.
  • NVD CVSS source eligibility is closed: NVD-authored, exact record-source, or registered same-CVE container origin; unmapped sources remain display-only.
  • Factor D is unknown in Public Core because no accepted canonical mapping-obligation ledger is present.
  • Core replay supports the active and immediately prior generation; retrospective valid-at replay is deferred.