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ExploitedIn CISA KEV

CVE-2017-6627

Exploitation confirmed. First attested on 2022-03-03 by CISA-ADP, CISA KEV, GCVE · kevintel.

  • Published2017-09-07
  • WeaknessCWE-399 · CWE-404

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

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.

Timeline

dates in UTC
  1. 2017-09-0721:29CVE publishedNVD
  2. 2022-03-03Added to the CISA KEV catalogCISA KEV
  3. 2022-03-03Listed as exploited by GCVEGCVE
  4. 2022-03-03Exploitation first reportedCISA KEV
  5. 2025-02-0415:23SSVC exploitation set to activeCISA-ADP

Observed activity

isMalicious corpus · updated 2026-10-23 18:48 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2017-6627?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2017-6627?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD
Cisco ios
BranchAffectedFixed in
15.1= 15.1\(2\)gcno fix published
15.1= 15.1\(2\)gc1no fix published
15.1= 15.1\(2\)gc2no fix published
15.1= 15.1\(4\)gcno fix published
15.1= 15.1\(4\)gc1no fix published
15.1= 15.1\(4\)gc2no fix published
15.2= 15.2\(1\)gcno fix published
15.2= 15.2\(1\)gc1no fix published
15.2= 15.2\(1\)gc2no fix published
15.2= 15.2\(2\)gcno fix published
15.2= 15.2\(3\)gcno fix published
15.2= 15.2\(3\)gc1no fix published
Cisco ios xe
BranchAffectedFixed in
3.14= 3.14.0sno fix published
3.14= 3.14.1sno fix published
3.14= 3.14.2sno fix published
3.14= 3.14.3sno fix published
3.14= 3.14.4sno fix published
3.15= 3.15.0sno fix published
3.15= 3.15.1csno fix published
3.15= 3.15.1sno fix published
3.15= 3.15.2sno fix published
3.15= 3.15.3sno fix published
3.15= 3.15.4sno fix published
3.16= 3.16.0csno fix published

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

  1. CISA’s required action: Apply updates per vendor instructions.due 2022-03-24

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof-of-concept repositories
none listed
PoC-in-GitHub

CISA Known Exploited Vulnerability

Date Added
2022-03-03
Patch Due Date
2022-03-24
Ransomware Use
Unknown
Required Action
Apply updates per vendor instructions.

Sources

  • CISA KEVKEV entry2022-03-03
  • GCVEexploitation2022-03-03
  • CISA-ADPSSVC decisionactive2025-02-04
  • OpenCVESSVC decisionactive—
  • CISA-ADPCVSS 3.17.52025-02-04
  • NVDCVSS 3.17.5read 2026-10-23
  • NVDCVSS 2.05read 2026-10-23
  • CNAweakness (CWE)CWE-399read 2026-10-23
  • NVDweakness (CWE)CWE-404read 2026-10-23
  • FIRST EPSSEPSS score6.2 %2026-10-22

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published
2017-09-07
Last Modified
2026-06-17
NVD status
Analyzed

Frequently asked questions

What is CVE-2017-6627?

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.

Is CVE-2017-6627 actively exploited?

Yes. CVE-2017-6627 is on the CISA Known Exploited Vulnerabilities (KEV) catalog, meaning it has been confirmed as actively exploited in the wild. CISA requires federal agencies to patch by 2022-03-24.

What is the CVSS score for CVE-2017-6627?

CVE-2017-6627 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

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