CVE-2015-6271

Name: CVE-2015-6271
Creator: NVD / NIST
Published: 2015-08-31T20:59:05.217+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

UnknownEPSS 1.99%

Last modified Jun 17, 2026

CVE-2015-6271 is a vulnerability of currently unknown severity. 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.. EPSS estimates a 1.99% chance of exploitation in the next 30 days.

Description

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.

Metrics

EPSS Probability

1.99%

78.1th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-399

Affected Software

Vendor	Product	Versions
Cisco	Ios Xe	2.1.0
Cisco	Ios Xe	2.1.1
Cisco	Ios Xe	2.1.2
Cisco	Ios Xe	2.1.3
Cisco	Ios Xe	2.2.1
Cisco	Ios Xe	2.2.2
Cisco	Ios Xe	2.2.3
Cisco	Ios Xe	2.3.0
Cisco	Ios Xe	2.3.0t
Cisco	Ios Xe	2.3.1t
Cisco	Ios Xe	2.3.2
Cisco	Ios Xe	2.4.0
Cisco	Ios Xe	2.4.1
Cisco	Ios Xe	2.4.2
Cisco	Ios Xe	2.4.3
Cisco	Ios Xe	2.5.0

References

Timeline

Published: Aug 31, 2015
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2015-6271?

How severe is CVE-2015-6271?

Severity scoring for CVE-2015-6271 is pending analysis. The EPSS model estimates a 1.99% probability of exploitation in the next 30 days.

How do I fix CVE-2015-6271?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2015-6271?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST