CVE-2017-6627
Cisco Ios Xe 3.14.0s … 3.18.3vs
Raw vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HCVSS and EPSS are reproduced from their sources (NVD, FIRST EPSS). Risk Priority is our own derived reading, not an NVD score.
Summary
CVE-2017-6627 is a high-severity Improper Resource Shutdown or Release (CWE-404) vulnerability in Cisco Ios Xe. Its CVSS base score is 7.5 (High).
Operationally, ranked in the top 7% of CVEs by exploit likelihood; CISA has added it to the Known Exploited Vulnerabilities catalog.
Deeper analysis AI-assisted summary
Synthesised by an AI model from the NVD description and linked references — a reading aid, not an authoritative source.
A vulnerability in the UDP processing code of Cisco IOS versions 15.1, 15.2, and 15.4 as well as IOS XE 3.14 through 3.18 stems from application changes that create UDP sockets and leave them idle without closing them. This flaw, tracked under Cisco Bug IDs CSCup10024, CSCva55744, and CSCva95506, can cause an affected device's input interface queue to retain UDP packets, resulting in a wedge condition and denial of service.
An unauthenticated remote attacker can exploit the issue by sending crafted UDP packets destined for port 0. Successful exploitation holds packets in the input queue until the limit of 250 packets is reached, producing a sustained DoS impact on the affected interface with no requirement for authentication or user interaction. The CVSS 3.1 score of 7.5 reflects the network attack vector and high availability consequences.
The referenced Cisco Security Advisory cisco-sa-20170906-ios-udp provides official guidance on mitigation steps and affected software updates. No information on observed in-the-wild exploitation is included in the supplied details.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2017-15681
Vulnerability Data
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…
more
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.
- CWE(s)
- KEV Date Added
- 03 March 2022
Related Threats
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Affected Assets
Mitigating Controls
Likely Mitigating Controls AI
Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.
Contingency plan updates incorporate proper resource shutdown and release steps, preventing attackers from leveraging incomplete cleanup during recovery scenarios.
Mandates explicit shutdown of the network connection at session conclusion, directly addressing improper resource release.
Requires proper shutdown/release procedures that include overwriting or isolating data to block unintended transfer via reused system objects.
Procedures can mandate orderly shutdown or release of resources when failures occur, preventing improper resource handling after a fault.
Mitigating Controls (ISO/IEC 27001:2022 Annex A) AI
Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→ISO cross-walk (authority under review) — links open the control.
documenting procedures for secure operation, error handling, restart/recovery and resource management (including references to 8.13/8.18) is a governance and dependency control that does not itself stop exploitation of a resource-shutdown flaw; any prevention would require other controls (e.g. code changes or runtime enforcement) configured to act on it
Hardening callouts derived
DISA STIG baselines are authored against specific weaknesses. Where this CVE cites a broad weakness class, the mapping is not asserted at that abstraction (owner ruling, 2026-09-25: grade only at Base and below), so no rule is shown here rather than a rule shown against the wrong grain.
- No fine-grained STIG row for CWE-404, a class-level weakness, and none of its children carries one either.