Evidence dossier

CVE-2017-6627

CVE-2017-6627

57.4–78.7Priority evidence range

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

Normalized restatement

A vulnerability in the UDP processing code of Cisco IOS 15.1, 15.2, and 15.4 and IOS XE 3.14 through 3.18 could allow an unauthenticated, remote attacker to cause the input queue of an affected system to hold UDP packets, causing an interface queue wedge and a denial of service (DoS) condition. The vulnerability is due to Cisco IOS Software application changes that create UDP sockets and leave the sockets idle without closing them. An attacker could exploit this vulnerability by sending UDP packets with a destination port of 0 to an affected device. A successful exploit could allow the attacker to cause UDP packets to be held in the input interfaces queue, resulting in a DoS condition. The input interface queue will stop holding UDP packets when it receives 250 packets. Cisco Bug IDs: CSCup10024, CSCva55744, CSCva95506.

State: PUBLISHED
Published: Sep 7, 2017
Updated: Oct 21, 2025
Evidence coverage: 72%

CISA KEVCatalog member

Apply updates per vendor instructions.

FIRST EPSS6.04%

2026-07-18 · v2026.06.15 · percentile 92.6%

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

Jul 19, 2026Original evidence ↗

ciscooriginal assertion

container

A vulnerability in the UDP processing code of Cisco IOS 15.1, 15.2, and 15.4 and IOS XE 3.14 through 3.18 could allow an unauthenticated, remote attacker to cause the input queue of an affected system to hold UDP packets, causing an interface queue wedge and a denial of service (DoS) condition. The vulnerability is due to Cisco IOS Software application changes that create UDP sockets and leave the sockets idle without closing them. An attacker could exploit this vulnerability by sending UDP packets with a destination port of 0 to an affected device. A successful exploit could allow the attacker to cause UDP packets to be held in the input interfaces queue, resulting in a DoS condition. The input interface queue will stop holding UDP packets when it receives 250 packets. Cisco Bug IDs: CSCup10024, CSCva55744, CSCva95506.

Jul 19, 2026Original evidence ↗

CVEderivative copy

container

CVE Program Container

Jul 19, 2026Original evidence ↗

CISA KEVoriginal assertion

observed_exploitation

Cisco IOS Software and Cisco IOS XE Software UDP Packet Processing Denial-of-Service Vulnerability

Jul 19, 2026Original evidence ↗

FIRST EPSSoriginal assertion

model_probability

Probability 0.060420000000; percentile 0.925580000000

Jul 19, 2026Original evidence ↗

Applicability

Cited product scope

Trace impact →

n/aCisco IOS and Cisco IOS XE

[{"status": "affected", "version": "Cisco IOS and Cisco IOS XE"}]unknown

Unknown vendorUnknown product

cpe:2.3:o:cisco:ios:15.1\(2\)gc:*:*:*:*:*:*:*supported

Unknown vendorUnknown product

cpe:2.3:o:cisco:ios:15.1\(2\)gc1:*:*:*:*:*:*:*supported

Unknown vendorUnknown product

cpe:2.3:o:cisco:ios:15.1\(2\)gc2:*:*:*:*:*:*:*supported

Unknown vendorUnknown product

cpe:2.3:o:cisco:ios:15.1\(4\)gc:*:*:*:*:*:*:*supported

Unknown vendorUnknown product

cpe:2.3:o:cisco:ios:15.1\(4\)gc1:*:*:*:*:*:*:*supported

Unknown vendorUnknown product

cpe:2.3:o:cisco:ios:15.1\(4\)gc2:*:*:*:*:*:*:*supported

Unknown vendorUnknown product

cpe:2.3:o:cisco:ios:15.2\(1\)gc:*:*:*:*:*:*:*supported

Unknown vendorUnknown product

cpe:2.3:o:cisco:ios:15.2\(1\)gc1:*:*:*:*:*:*:*supported

Unknown vendorUnknown product

cpe:2.3:o:cisco:ios:15.2\(1\)gc2:*:*:*:*:*:*:*supported

Unknown vendorUnknown product

cpe:2.3:o:cisco:ios:15.2\(2\)gc:*:*:*:*:*:*:*supported

Unknown vendorUnknown product

cpe:2.3:o:cisco:ios:15.2\(3\)gc:*:*:*:*:*:*:*supported

Unknown vendorUnknown product

cpe:2.3:o:cisco:ios:15.2\(3\)gc1:*:*:*:*:*:*:*supported

Unknown vendorUnknown product

cpe:2.3:o:cisco:ios:15.2\(3r\)gca:*:*:*:*:*:*:*supported

Unknown vendorUnknown product

cpe:2.3:o:cisco:ios:15.2\(4\)gc:*:*:*:*:*:*:*supported

Unknown vendorUnknown product

cpe:2.3:o:cisco:ios:15.2\(4\)gc1:*:*:*:*:*:*:*supported

Unknown vendorUnknown product

cpe:2.3:o:cisco:ios:15.2\(4\)gc2:*:*:*:*:*:*:*supported

Unknown vendorUnknown product

cpe:2.3:o:cisco:ios:15.2\(4\)gc3:*:*:*:*:*:*:*supported

Unknown vendorUnknown product

cpe:2.3:o:cisco:ios:15.4\(1\)t:*:*:*:*:*:*:*supported

Unknown vendorUnknown product

cpe:2.3:o:cisco:ios:15.4\(1\)t1:*:*:*:*:*:*:*supported

Unknown vendorUnknown product

cpe:2.3:o:cisco:ios:15.4\(1\)t2:*:*:*:*:*:*:*supported

Unknown vendorUnknown product

cpe:2.3:o:cisco:ios:15.4\(1\)t3:*:*:*:*:*:*:*supported

Unknown vendorUnknown product

cpe:2.3:o:cisco:ios:15.4\(1\)t4:*:*:*:*:*:*:*supported

Unknown vendorUnknown product

cpe:2.3:o:cisco:ios:15.4\(2\)t:*:*:*:*:*:*:*supported

Unknown vendorUnknown product

cpe:2.3:o:cisco:ios:15.4\(2\)t1:*:*:*:*:*:*:*supported

Unknown vendorUnknown product

cpe:2.3:o:cisco:ios:15.4\(2\)t2:*:*:*:*:*:*:*supported

Unknown vendorUnknown product

cpe:2.3:o:cisco:ios:15.4\(3\)m:*:*:*:*:*:*:*supported

Unknown vendorUnknown product

cpe:2.3:o:cisco:ios:15.4\(3\)m1:*:*:*:*:*:*:*supported

Unknown vendorUnknown product

cpe:2.3:o:cisco:ios:15.4\(3\)m2:*:*:*:*:*:*:*supported

Unknown vendorUnknown product

cpe:2.3:o:cisco:ios:15.4\(3\)m2.2:*:*:*:*:*:*:*supported

Unknown vendorUnknown product

cpe:2.3:o:cisco:ios:15.4\(3\)m3:*:*:*:*:*:*:*supported

Unknown vendorUnknown product

cpe:2.3:o:cisco:ios:15.4\(3\)m4:*:*:*:*:*:*:*supported

Unknown vendorUnknown product

cpe:2.3:o:cisco:ios:15.4\(3\)m5:*:*:*:*:*:*:*supported

Unknown vendorUnknown product

cpe:2.3:o:cisco:ios:15.4\(3\)m6:*:*:*:*:*:*:*supported

Unknown vendorUnknown product

cpe:2.3:o:cisco:ios:15.4\(3\)m6a:*:*:*:*:*:*:*supported

Unknown vendorUnknown product

cpe:2.3:o:cisco:ios:15.4\(3\)m7:*:*:*:*:*:*:*supported

Unknown vendorUnknown product

cpe:2.3:o:cisco:ios_xe:3.14.0s:*:*:*:*:*:*:*supported

Unknown vendorUnknown product

cpe:2.3:o:cisco:ios_xe:3.14.1s:*:*:*:*:*:*:*supported

Unknown vendorUnknown product

cpe:2.3:o:cisco:ios_xe:3.14.2s:*:*:*:*:*:*:*supported

Unknown vendorUnknown product

cpe:2.3:o:cisco:ios_xe:3.14.3s:*:*:*:*:*:*:*supported

Unknown vendorUnknown product

cpe:2.3:o:cisco:ios_xe:3.14.4s:*:*:*:*:*:*:*supported

Unknown vendorUnknown product

cpe:2.3:o:cisco:ios_xe:3.15.0s:*:*:*:*:*:*:*supported

Unknown vendorUnknown product

cpe:2.3:o:cisco:ios_xe:3.15.1cs:*:*:*:*:*:*:*supported

Unknown vendorUnknown product

cpe:2.3:o:cisco:ios_xe:3.15.1s:*:*:*:*:*:*:*supported

Unknown vendorUnknown product

cpe:2.3:o:cisco:ios_xe:3.15.2s:*:*:*:*:*:*:*supported

Unknown vendorUnknown product

cpe:2.3:o:cisco:ios_xe:3.15.3s:*:*:*:*:*:*:*supported

Unknown vendorUnknown product

cpe:2.3:o:cisco:ios_xe:3.15.4s:*:*:*:*:*:*:*supported

Unknown vendorUnknown product

cpe:2.3:o:cisco:ios_xe:3.16.0cs:*:*:*:*:*:*:*supported

Unknown vendorUnknown product

cpe:2.3:o:cisco:ios_xe:3.16.0s:*:*:*:*:*:*:*supported

Unknown vendorUnknown product

cpe:2.3:o:cisco:ios_xe:3.16.1as:*:*:*:*:*:*:*supported

Unknown vendorUnknown product

cpe:2.3:o:cisco:ios_xe:3.16.1s:*:*:*:*:*:*:*supported

Unknown vendorUnknown product

cpe:2.3:o:cisco:ios_xe:3.16.2as:*:*:*:*:*:*:*supported

Unknown vendorUnknown product

cpe:2.3:o:cisco:ios_xe:3.16.2bs:*:*:*:*:*:*:*supported

Unknown vendorUnknown product

cpe:2.3:o:cisco:ios_xe:3.16.2s:*:*:*:*:*:*:*supported

Unknown vendorUnknown product

cpe:2.3:o:cisco:ios_xe:3.16.3as:*:*:*:*:*:*:*supported

Unknown vendorUnknown product

cpe:2.3:o:cisco:ios_xe:3.16.3s:*:*:*:*:*:*:*supported

Unknown vendorUnknown product

cpe:2.3:o:cisco:ios_xe:3.16.4as:*:*:*:*:*:*:*supported

Unknown vendorUnknown product

cpe:2.3:o:cisco:ios_xe:3.16.4bs:*:*:*:*:*:*:*supported

Unknown vendorUnknown product

cpe:2.3:o:cisco:ios_xe:3.16.4ds:*:*:*:*:*:*:*supported

Unknown vendorUnknown product

cpe:2.3:o:cisco:ios_xe:3.16.4s:*:*:*:*:*:*:*supported

Unknown vendorUnknown product

cpe:2.3:o:cisco:ios_xe:3.16.5s:*:*:*:*:*:*:*supported

Unknown vendorUnknown product

cpe:2.3:o:cisco:ios_xe:3.16.6s:*:*:*:*:*:*:*supported

Unknown vendorUnknown product

cpe:2.3:o:cisco:ios_xe:3.17.0s:*:*:*:*:*:*:*supported

Unknown vendorUnknown product

cpe:2.3:o:cisco:ios_xe:3.17.1as:*:*:*:*:*:*:*supported

Unknown vendorUnknown product

cpe:2.3:o:cisco:ios_xe:3.17.1s:*:*:*:*:*:*:*supported

Unknown vendorUnknown product

cpe:2.3:o:cisco:ios_xe:3.17.3s:*:*:*:*:*:*:*supported

Unknown vendorUnknown product

cpe:2.3:o:cisco:ios_xe:3.18.0as:*:*:*:*:*:*:*supported

Unknown vendorUnknown product

cpe:2.3:o:cisco:ios_xe:3.18.0s:*:*:*:*:*:*:*supported

Unknown vendorUnknown product

cpe:2.3:o:cisco:ios_xe:3.18.1s:*:*:*:*:*:*:*supported

Unknown vendorUnknown product

cpe:2.3:o:cisco:ios_xe:3.18.2s:*:*:*:*:*:*:*supported

Unknown vendorUnknown product

cpe:2.3:o:cisco:ios_xe:3.18.3s:*:*:*:*:*:*:*supported

Unknown vendorUnknown product

cpe:2.3:o:cisco:ios_xe:3.18.3vs:*:*:*:*:*:*:*supported

Assessments

CVSS by origin

7.5

nvd@nist.govCVSS 3.1 · role PrimaryCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/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

7.5

134c704f-9b21-4f2e-91b3-4a467353bcc0CVSS 3.1 · role SecondaryCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

7.5

CISA-ADPCVSS 3.1 · role unknownCVSS:3.1/AV:N/AC:L/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.