CVE-2013-5477: The T1/E1 driver-queue functionality in Cisco IOS 12.2 and 15.0 through 15.3, when an HDLC32 driver is used...

Security readout for executives and security teams

This issue affects Cisco IOS routers using T1/E1 interfaces with the HDLC32 driver. Bursty traffic can wedge an interface queue, causing a denial of service on affected links. The provided sources do not include CVSS, confirmed exploitation, or detailed remediation text. Likely exposure is limited to organizations still running affected Cisco IOS releases with T1/E1 interfaces using the HDLC32 driver. Internet exposure depends on where those circuits terminate and what traffic can reach them. Prioritize based on dependency on legacy T1/E1 Cisco IOS links. This is not a data-theft issue, but it can disrupt connectivity where affected circuits support critical operations. Mitigation focus: Review Cisco advisory cisco-sa-20130925-wedge for vendor-approved fixed releases or workarounds.; Inventory Cisco IOS 12.2 and 15.0 through 15.3 devices using T1/E1 HDLC32 interfaces.; Prioritize remediation for WAN, carrier, or customer-facing circuits where service interruption matters..

Prepared

Jun 14, 2026, 15:32 UTC (UTC+00:00)

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.