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CVE-2016-6441

35
FAUCET Score

CVE-2016-6441 is a critical vulnerability in the Transaction Language 1 (TL1) code of Cisco ASR 900 Series routers running specific versions of Cisco IOS XE Software. An unauthenticated, remote attacker can exploit this to cause a denial of service (reload) or achieve remote code execution on affected systems. With a CVSS score of 9.8 (CRITICAL) and a FAUCET Risk Score of 94/100, the vulnerability is easily exploitable over the network with no user interaction, leading to complete compromise of confidentiality, integrity, and availability. While there is no evidence of active exploitation or public exploit code (Metasploit, Nuclei, ExploitDB), the vulnerability has garnered significant community discussion, indicating awareness among security researchers.

Impacted Technologies

VendorProductVersion(s)CPE
3.17.0sCPE matchmatch criteria
cpe:2.3:o:cisco:ios_xe:3.17.0s:*:*:*:*:*:*:*
3.17.1sCPE matchmatch criteria
cpe:2.3:o:cisco:ios_xe:3.17.1s:*:*:*:*:*:*:*
3.17.2sCPE matchmatch criteria
cpe:2.3:o:cisco:ios_xe:3.17.2s:*:*:*:*:*:*:*
3.17sCPE matchmatch criteria
cpe:2.3:o:cisco:ios_xe:3.17s:*:*:*:*:*:*:*
3.18.0sCPE matchmatch criteria
cpe:2.3:o:cisco:ios_xe:3.18.0s:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

9.8CRITICAL

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
5.9
CvssVersion
3.0

Exploit Intelligence

EPSS Score
4.90%
Probability of exploitation in next 30 days
EPSS Percentile
91.2%
Percentile rank of EPSS score among Peer Group
As of 2026-07-26
Model: v2026.06.15
This CVE's current EPSS score of 0.0490 is in the 85th percentile among its peer group of 36,835 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Vendor Patches (1)

ciscovendor investigatingvia nvd_reference
View patch

References

tools.cisco.com / security/center/content/CiscoSecurityAdvisory/cisco-sa-20161102-tl1
Vendor Advisory
securityfocus.com / bid/94072
securitytracker.com / id/1037179