Evidence dossier

CVE-2020-3569

Cisco IOS XR Software DVMRP Memory Exhaustion Vulnerabilities

56.1–80.1Priority evidence range

As known Jul 19, 2026, 5:00 AM UTCgen-56ccdaf9

Normalized restatement

Multiple vulnerabilities in the Distance Vector Multicast Routing Protocol (DVMRP) feature of Cisco IOS XR Software could allow an unauthenticated, remote attacker to either immediately crash the Internet Group Management Protocol (IGMP) process or make it consume available memory and eventually crash. The memory consumption may negatively impact other processes that are running on the device. These vulnerabilities are due to the incorrect handling of IGMP packets. An attacker could exploit these vulnerabilities by sending crafted IGMP traffic to an affected device. A successful exploit could allow the attacker to immediately crash the IGMP process or cause memory exhaustion, resulting in other processes becoming unstable. These processes may include, but are not limited to, interior and exterior routing protocols. Cisco will release software updates that address these vulnerabilities.

State: PUBLISHED
Published: Sep 23, 2020
Updated: Oct 21, 2025
Evidence coverage: 72%

CISA KEVCatalog member

Apply updates per vendor instructions.

FIRST EPSS3.29%

2026-07-18 · v2026.06.15 · percentile 87.1%

Source stateConflict visible

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

Source comparison

Who said what

CISA-ADPindependent enrichment

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CISA ADP Vulnrichment

Jul 19, 2026Original evidence ↗

ciscooriginal assertion

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Cisco IOS XR Software DVMRP Memory Exhaustion Vulnerabilities

Jul 19, 2026Original evidence ↗

CVEderivative copy

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CVE Program Container

Jul 19, 2026Original evidence ↗

CISA KEVoriginal assertion

observed_exploitation

Cisco IOS XR Software DVMRP Memory Exhaustion Vulnerability

Jul 19, 2026Original evidence ↗

FIRST EPSSoriginal assertion

model_probability

Probability 0.032930000000; percentile 0.871170000000

Jul 19, 2026Original evidence ↗

Applicability

Cited product scope

Trace impact →

CiscoCisco IOS XR Software

[{"status": "affected", "version": "n/a"}]unknown

Unknown vendorUnknown product

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cpe:2.3:h:cisco:asr_9001:-:*:*:*:*:*:*:*constrained

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cpe:2.3:h:cisco:asr_9006:-:*:*:*:*:*:*:*constrained

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cpe:2.3:h:cisco:asr_9010:-:*:*:*:*:*:*:*constrained

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cpe:2.3:h:cisco:asr_9901:-:*:*:*:*:*:*:*constrained

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cpe:2.3:h:cisco:asr_9903:-:*:*:*:*:*:*:*constrained

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cpe:2.3:h:cisco:asr_9904:-:*:*:*:*:*:*:*constrained

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cpe:2.3:h:cisco:asr_9906:-:*:*:*:*:*:*:*constrained

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cpe:2.3:h:cisco:asr_9910:-:*:*:*:*:*:*:*constrained

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cpe:2.3:h:cisco:asr_9912:-:*:*:*:*:*:*:*constrained

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cpe:2.3:h:cisco:asr_9922:-:*:*:*:*:*:*:*constrained

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cpe:2.3:h:cisco:crs:-:*:*:*:*:*:*:*constrained

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cpe:2.3:h:cisco:crs-1_16-slot_line_card_chassis:-:*:*:*:*:*:*:*constrained

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cpe:2.3:h:cisco:crs-1_16-slot_single-shelf_system:-:*:*:*:*:*:*:*constrained

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cpe:2.3:h:cisco:crs-1_4-slot_single-shelf_system:-:*:*:*:*:*:*:*constrained

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cpe:2.3:h:cisco:crs-1_8-slot_line_card_chassis:-:*:*:*:*:*:*:*constrained

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cpe:2.3:h:cisco:crs-1_8-slot_single-shelf_system:-:*:*:*:*:*:*:*constrained

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cpe:2.3:h:cisco:crs-1_fabric_card_chassis:-:*:*:*:*:*:*:*constrained

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cpe:2.3:h:cisco:crs-1_line_card_chassis_\(dual\):-:*:*:*:*:*:*:*constrained

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cpe:2.3:h:cisco:crs-1_line_card_chassis_\(multi\):-:*:*:*:*:*:*:*constrained

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cpe:2.3:h:cisco:crs-1_multishelf_system:-:*:*:*:*:*:*:*constrained

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cpe:2.3:h:cisco:crs-3_16-slot_single-shelf_system:-:*:*:*:*:*:*:*constrained

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cpe:2.3:h:cisco:crs-3_8-slot_single-shelf_system:-:*:*:*:*:*:*:*constrained

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cpe:2.3:h:cisco:crs-3_multishelf_system:-:*:*:*:*:*:*:*constrained

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cpe:2.3:h:cisco:crs-8\/s-b_crs:-:*:*:*:*:*:*:*constrained

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cpe:2.3:h:cisco:crs-8\/scrs:-:*:*:*:*:*:*:*constrained

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cpe:2.3:h:cisco:crs_performance_route_processor:-:*:*:*:*:*:*:*constrained

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cpe:2.3:h:cisco:crs-x:-:*:*:*:*:*:*:*constrained

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cpe:2.3:h:cisco:crs-x_16-slot_single-shelf_system:-:*:*:*:*:*:*:*constrained

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cpe:2.3:h:cisco:crs-x_multishelf_system:-:*:*:*:*:*:*:*constrained

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cpe:2.3:h:cisco:ncs_5001:-:*:*:*:*:*:*:*constrained

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cpe:2.3:h:cisco:ncs_5001:-:*:*:*:*:*:*:*constrained

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cpe:2.3:h:cisco:ncs_5002:-:*:*:*:*:*:*:*constrained

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cpe:2.3:h:cisco:ncs_5002:-:*:*:*:*:*:*:*constrained

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cpe:2.3:h:cisco:ncs_5011:-:*:*:*:*:*:*:*constrained

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cpe:2.3:h:cisco:ncs_5011:-:*:*:*:*:*:*:*constrained

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cpe:2.3:h:cisco:ncs_520:-:*:*:*:*:*:*:*constrained

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cpe:2.3:h:cisco:ncs_520:-:*:*:*:*:*:*:*constrained

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cpe:2.3:h:cisco:ncs_540:-:*:*:*:*:*:*:*constrained

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cpe:2.3:h:cisco:ncs_540:-:*:*:*:*:*:*:*constrained

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cpe:2.3:h:cisco:ncs_5501:-:*:*:*:*:*:*:*constrained

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cpe:2.3:h:cisco:ncs_5501:-:*:*:*:*:*:*:*constrained

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cpe:2.3:h:cisco:ncs_5501:se:*:*:*:*:*:*:*constrained

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cpe:2.3:h:cisco:ncs_5501:se:*:*:*:*:*:*:*constrained

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cpe:2.3:h:cisco:ncs_5502:-:*:*:*:*:*:*:*constrained

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cpe:2.3:h:cisco:ncs_5502:-:*:*:*:*:*:*:*constrained

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cpe:2.3:h:cisco:ncs_5502:se:*:*:*:*:*:*:*constrained

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cpe:2.3:h:cisco:ncs_5502:se:*:*:*:*:*:*:*constrained

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cpe:2.3:h:cisco:ncs_5508:-:*:*:*:*:*:*:*constrained

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cpe:2.3:h:cisco:ncs_5508:-:*:*:*:*:*:*:*constrained

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cpe:2.3:h:cisco:ncs_5516:-:*:*:*:*:*:*:*constrained

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cpe:2.3:h:cisco:ncs_5516:-:*:*:*:*:*:*:*constrained

Unknown vendorUnknown product

cpe:2.3:h:cisco:ncs_560:-:*:*:*:*:*:*:*constrained

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cpe:2.3:h:cisco:ncs_560:-:*:*:*:*:*:*:*constrained

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cpe:2.3:h:cisco:ncs_6008:-:*:*:*:*:*:*:*constrained

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cpe:2.3:h:cisco:ncs_6008:-:*:*:*:*:*:*:*constrained

Unknown vendorUnknown product

cpe:2.3:o:cisco:ios_xr:*:*:*:*:*:*:*:*; end excluding 6.5.2supported

Unknown vendorUnknown product

cpe:2.3:o:cisco:ios_xr:6.1.4:*:*:*:*:*:*:*supported

Unknown vendorUnknown product

cpe:2.3:o:cisco:ios_xr:6.1.4:*:*:*:*:*:*:*supported

Unknown vendorUnknown product

cpe:2.3:o:cisco:ios_xr:6.2.3:*:*:*:*:*:*:*supported

Unknown vendorUnknown product

cpe:2.3:o:cisco:ios_xr:6.3.3:*:*:*:*:*:*:*supported

Unknown vendorUnknown product

cpe:2.3:o:cisco:ios_xr:6.4.2:*:*:*:*:*:*:*supported

Unknown vendorUnknown product

cpe:2.3:o:cisco:ios_xr:6.4.2:*:*:*:*:*:*:*supported

Unknown vendorUnknown product

cpe:2.3:o:cisco:ios_xr:6.4.3:*:*:*:*:*:*:*supported

Unknown vendorUnknown product

cpe:2.3:o:cisco:ios_xr:6.5.3:*:*:*:*:*:*:*supported

Unknown vendorUnknown product

cpe:2.3:o:cisco:ios_xr:6.6.2:*:*:*:*:*:*:*supported

Unknown vendorUnknown product

cpe:2.3:o:cisco:ios_xr:6.6.3:*:*:*:*:*:*:*supported

Unknown vendorUnknown product

cpe:2.3:o:cisco:ios_xr:7.0.2:*:*:*:*:*:*:*supported

Unknown vendorUnknown product

cpe:2.3:o:cisco:ios_xr:7.1.15:*:*:*:*:*:*:*supported

Unknown vendorUnknown product

cpe:2.3:o:cisco:ios_xr:7.1.2:*:*:*:*:*:*:*supported

Assessments

CVSS by origin

8.6

nvd@nist.govCVSS 3.1 · role PrimaryCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H

5.0

nvd@nist.govCVSS 2.0 · role PrimaryAV:N/AC:L/Au:N/C:N/I:N/A:P

8.6

psirt@cisco.comCVSS 3.1 · role SecondaryCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H

8.6

ciscoCVSS 3.1 · role unknownCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/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.