CVE-2026-20173 (GCVE-0-2026-20173)
Vulnerability from cvelistv5
Published
2026-10-07 16:12
Modified
2026-10-07 17:42
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-770 - Allocation of Resources Without Limits or Throttling
Summary
A vulnerability in Cisco NX-OS Software could allow an unauthenticated, remote attacker to exhaust system resources, causing a denial of service (DoS) condition.
This vulnerability exists because rate limiting was improperly applied to some protocols. An attacker could exploit this vulnerability by sending a high rate of UDP or TCP connections to a data plane interface on an affected device. A successful exploit could allow the attacker to cause instability to various routing and control plane protocols through some packet loss and temporary disruptions, causing a DoS condition. This DoS condition will clear without manual intervention soon after the high rate of traffic is stopped.
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Cisco | Cisco NX-OS Software |
Version: 8.2(5) Version: 7.3(5)D1(1) Version: 8.4(2) Version: 8.4(3) Version: 9.2(3) Version: 9.2(2v) Version: 7.3(4)D1(1) Version: 8.2(1) Version: 9.2(1) Version: 9.2(2t) Version: 9.2(3y) Version: 9.3(2) Version: 8.1(1) Version: 8.2(2) Version: 8.3(2) Version: 7.3(2)D1(3a) Version: 9.2(4) Version: 8.1(2) Version: 7.3(3)D1(1) Version: 8.2(3) Version: 8.4(1) Version: 7.3(0)DX(1) Version: 7.3(2)D1(1) Version: 9.3(1) Version: 7.3(2)D1(2) Version: 8.2(4) Version: 9.3(1z) Version: 9.2(2) Version: 8.1(2a) Version: 7.3(2)D1(3) Version: 8.3(1) Version: 7.3(1)D1(1) Version: 7.3(0)D1(1) Version: 9.3(3) Version: 7.3(2)D1(1d) Version: 9.3(4) Version: 7.3(6)D1(1) Version: 8.2(6) Version: 9.3(5) Version: 9.3(6) Version: 8.4(4) Version: 7.3(7)D1(1) Version: 9.3(5w) Version: 8.2(7) Version: 9.3(7) Version: 9.3(7k) Version: 7.3(8)D1(1) Version: 9.3(7a) Version: 8.2(7a) Version: 9.3(8) Version: 8.4(4a) Version: 8.4(5) Version: 8.2(8) Version: 9.3(9) Version: 7.3(9)D1(1) Version: 8.4(6) Version: 9.3(10) Version: 8.2(9) Version: 10.3(1) Version: 8.4(7) Version: 10.3(2) Version: 8.4(6a) Version: 9.3(11) Version: 10.3(3) Version: 8.2(10) Version: 9.3(12) Version: 10.4(1) Version: 8.4(8) Version: 10.3(99w) Version: 10.3(3w) Version: 10.3(99x) Version: 10.3(3o) Version: 8.4(9) Version: 10.3(4) Version: 10.3(3p) Version: 10.3(4a) Version: 10.4(2) Version: 10.3(3q) Version: 9.3(13) Version: 8.2(11) Version: 10.3(5) Version: 10.4(3) Version: 10.3(3x) Version: 10.3(4g) Version: 10.5(1) Version: 8.4(10) Version: 10.3(3r) Version: 10.3(6) Version: 9.3(14) Version: 10.4(4) Version: 10.3(4h) Version: 10.5(2) Version: 8.4(11) Version: 10.3(7) Version: 10.4(5) Version: 10.5(3) Version: 9.3(15) Version: 10.4(4g) Version: 10.5(4) Version: 8.4(12) Version: 10.5(3t) Version: 10.3(8) Version: 10.4(6) Version: 10.5(3s) Version: 10.5(3e) Version: 10.5(3o) Version: 9.3(16) Version: 10.5(3p) Version: 10.4(7) Version: 10.5(5) Version: 9.3(17) |
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\"8.4(8)\"}, {\"status\": \"affected\", \"version\": \"10.3(99w)\"}, {\"status\": \"affected\", \"version\": \"10.3(3w)\"}, {\"status\": \"affected\", \"version\": \"10.3(99x)\"}, {\"status\": \"affected\", \"version\": \"10.3(3o)\"}, {\"status\": \"affected\", \"version\": \"8.4(9)\"}, {\"status\": \"affected\", \"version\": \"10.3(4)\"}, {\"status\": \"affected\", \"version\": \"10.3(3p)\"}, {\"status\": \"affected\", \"version\": \"10.3(4a)\"}, {\"status\": \"affected\", \"version\": \"10.4(2)\"}, {\"status\": \"affected\", \"version\": \"10.3(3q)\"}, {\"status\": \"affected\", \"version\": \"9.3(13)\"}, {\"status\": \"affected\", \"version\": \"8.2(11)\"}, {\"status\": \"affected\", \"version\": \"10.3(5)\"}, {\"status\": \"affected\", \"version\": \"10.4(3)\"}, {\"status\": \"affected\", \"version\": \"10.3(3x)\"}, {\"status\": \"affected\", \"version\": \"10.3(4g)\"}, {\"status\": \"affected\", \"version\": \"10.5(1)\"}, {\"status\": \"affected\", \"version\": \"8.4(10)\"}, {\"status\": \"affected\", \"version\": \"10.3(3r)\"}, {\"status\": \"affected\", \"version\": \"10.3(6)\"}, {\"status\": \"affected\", \"version\": \"9.3(14)\"}, {\"status\": \"affected\", \"version\": \"10.4(4)\"}, {\"status\": \"affected\", \"version\": \"10.3(4h)\"}, {\"status\": \"affected\", \"version\": \"10.5(2)\"}, {\"status\": \"affected\", \"version\": \"8.4(11)\"}, {\"status\": \"affected\", \"version\": \"10.3(7)\"}, {\"status\": \"affected\", \"version\": \"10.4(5)\"}, {\"status\": \"affected\", \"version\": \"10.5(3)\"}, {\"status\": \"affected\", \"version\": \"9.3(15)\"}, {\"status\": \"affected\", \"version\": \"10.4(4g)\"}, {\"status\": \"affected\", \"version\": \"10.5(4)\"}, {\"status\": \"affected\", \"version\": \"8.4(12)\"}, {\"status\": \"affected\", \"version\": \"10.5(3t)\"}, {\"status\": \"affected\", \"version\": \"10.3(8)\"}, {\"status\": \"affected\", \"version\": \"10.4(6)\"}, {\"status\": \"affected\", \"version\": \"10.5(3s)\"}, {\"status\": \"affected\", \"version\": \"10.5(3e)\"}, {\"status\": \"affected\", \"version\": \"10.5(3o)\"}, {\"status\": \"affected\", \"version\": \"9.3(16)\"}, {\"status\": \"affected\", \"version\": \"10.5(3p)\"}, {\"status\": \"affected\", \"version\": \"10.4(7)\"}, {\"status\": \"affected\", \"version\": \"10.5(5)\"}, {\"status\": \"affected\", \"version\": \"9.3(17)\"}], \"defaultStatus\": \"unknown\"}], \"exploits\": [{\"lang\": \"en\", \"value\": \"The Cisco Product Security Incident Response Team (PSIRT) is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory.\"}], \"references\": [{\"url\": \"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-nxos-nscpdos-SnderkC7\", \"name\": \"cisco-sa-nxos-nscpdos-SnderkC7\"}], \"descriptions\": [{\"lang\": \"en\", \"value\": \"A vulnerability in Cisco NX-OS Software could allow an unauthenticated, remote attacker to exhaust system resources, causing a denial of service (DoS) condition.\\r\\n\\r\\nThis vulnerability exists because rate limiting was improperly applied to some protocols. An attacker could exploit this vulnerability by sending a high rate of UDP or TCP connections to a data plane interface on an affected device. A successful exploit could allow the attacker to cause instability to various routing and control plane protocols through some packet loss and temporary disruptions, causing a DoS condition. This DoS condition will clear without manual intervention soon after the high rate of traffic is stopped.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"cwe\", \"cweId\": \"CWE-770\", \"description\": \"Allocation of Resources Without Limits or Throttling\"}]}], \"providerMetadata\": {\"orgId\": \"d1c1063e-7a18-46af-9102-31f8928bc633\", \"shortName\": \"cisco\", \"dateUpdated\": \"2026-10-07T16:12:04.505Z\"}}}",
"cveMetadata": "{\"cveId\": \"CVE-2026-20173\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-10-07T17:42:39.672Z\", \"dateReserved\": \"2025-10-08T11:59:15.392Z\", \"assignerOrgId\": \"d1c1063e-7a18-46af-9102-31f8928bc633\", \"datePublished\": \"2026-10-07T16:12:04.505Z\", \"assignerShortName\": \"cisco\"}",
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
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