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CVE-2015-0646

21
FAUCET Score

CVE-2015-0646 describes a memory leak vulnerability within the TCP input module of Cisco IOS and IOS XE software versions. This flaw allows remote attackers to trigger a denial of service, potentially leading to memory exhaustion or device reloads, by sending specially crafted TCP packets over IPv4 or IPv6. The vulnerability has a CVSS score of 7.8, indicating high severity due to its network-based attack vector, low attack complexity, and complete impact on availability. There is no evidence of active exploitation, and no public exploit code is available in Metasploit, Nuclei, or ExploitDB, with minimal community discussion and media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
3.3xo.0CPE matchmatch criteria
cpe:2.3:o:cisco:ios_xe:3.3xo.0:*:*:*:*:*:*:*
3.3xo.1CPE matchmatch criteria
cpe:2.3:o:cisco:ios_xe:3.3xo.1:*:*:*:*:*:*:*
3.3xo.2CPE matchmatch criteria
cpe:2.3:o:cisco:ios_xe:3.3xo.2:*:*:*:*:*:*:*
3.5e.0CPE matchmatch criteria
cpe:2.3:o:cisco:ios_xe:3.5e.0:*:*:*:*:*:*:*
3.5e.1CPE matchmatch criteria
cpe:2.3:o:cisco:ios_xe:3.5e.1:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 2.0

7.8HIGH

AV:N/AC:L/Au:N/C:N/I:N/A:C

Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
COMPLETE
Access Vector
NETWORK
Access Complexity
LOW
Authentication
NONE
Exploitability Score
10.0
Impact Score
6.9
CvssVersion
2.0

Exploit Intelligence

EPSS Score
3.78%
Probability of exploitation in next 30 days
EPSS Percentile
88.8%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0378 is in the 80th percentile among its peer group of 51,551 CVEs.

Social Chatter

No social media mentions found for this CVE.

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.1 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-20150325-tcpleak
Vendor Advisory
securityfocus.com / bid/73340
securitytracker.com / id/1031980