CVE-2015-6271: n/a vulnerability

CVE-2015-6271: Cisco IOS XE 2.1.0 through 2.4.3 and 2.5.0 on ASR 1000 devices, when NAT Application Layer Gateway is used,...

Cisco IOS XE 2.1.0 through 2.4.3 and 2.5.0 on ASR 1000 devices, when NAT Application Layer Gateway is used, allows remote attackers to cause a denial of service (Embedded Services Processor crash) via a crafted SIP packet, aka Bug IDs CSCta74749 and CSCta77008.

UnknownCVSS not scoredNot KEV-listedUpdatedAug 6, 2024, 07:15 UTC (UTC+00:00)

Security readout for executives and security teams

This CVE affects Cisco ASR 1000 routers running specific IOS XE releases when NAT Application Layer Gateway is used. A remote attacker could send a crafted SIP packet that crashes the Embedded Services Processor, causing denial of service. Business impact depends on whether these routers support critical voice, edge, or aggregation traffic. Exposure is likely limited to Cisco ASR 1000 deployments on the listed IOS XE versions with NAT ALG enabled and SIP traffic reachable from untrusted or semi-trusted networks. Treat as high priority where affected ASR 1000 routers carry production edge, aggregation, or voice traffic. The main risk is service outage from a remote packet path, so remediation should be scheduled according to business criticality. Mitigation focus: Identify ASR 1000 routers running IOS XE 2.1.0 through 2.5.0.; Confirm whether NAT Application Layer Gateway is enabled.; Review Cisco alert 40688 for vendor-supported fixes or workarounds..

Prepared: Jun 13, 2026, 22:03 UTC (UTC+00:00)

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

Potential ATT&CK relevance

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Vulnerability profileCVE Program record

Severity: Unknown
CVSS: Not scored
Known Exploited: No
Published: Aug 31, 2015, 20:00 UTC (UTC+00:00)

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

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1Source links

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Source materials

CVE List V5 sourceCVE List V5

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus

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Weakness

CWE details

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