How severe is CVE-2015-0646?

CVE-2015-0646 has a CVSS 2.0 base score of 7.8, rated high severity.

Is CVE-2015-0646 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 4% (89th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2015-0646?

CVE-2015-0646 primarily affects Cisco Ios Xe. In total, 36 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2015-0646?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2015-0646 published?

CVE-2015-0646 was published on 2015-03-26 and last updated on 2026-06-17.

CVE-2015-0646

CVE-2015-0646 is a high-severity vulnerability in Cisco Ios Xe with a CVSS 2.0 base score of 7.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-399.

Key facts

Severity: High (CVSS 2.0 base score 7.8)
EPSS exploit prediction: 4% (89th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-399
Affected product: Cisco Ios Xe
Published: 2015-03-26
Last modified: 2026-06-17

Description

Memory leak in the TCP input module in Cisco IOS 12.2, 12.4, 15.0, 15.2, 15.3, and 15.4 and IOS XE 3.3.xXO, 3.5.xE, 3.6.xE, 3.8.xS through 3.10.xS before 3.10.5S, and 3.11.xS and 3.12.xS before 3.12.3S allows remote attackers to cause a denial of service (memory consumption or device reload) by sending crafted TCP packets over (1) IPv4 or (2) IPv6, aka Bug ID CSCum94811.

Frequently asked questions

What is CVE-2015-0646?: Memory leak in the TCP input module in Cisco IOS 12.2, 12.4, 15.0, 15.2, 15.3, and 15.4 and IOS XE 3.3.xXO, 3.5.xE, 3.6.xE, 3.8.xS through 3.10.xS before 3.10.5S, and 3.11.xS and 3.12.xS before 3.12.3S allows remote attackers to cause a denial of service (memory consumption or device reload) by sending crafted TCP packets over (1) IPv4 or (2) IPv6, aka Bug ID CSCum94811.
How severe is CVE-2015-0646?: CVE-2015-0646 has a CVSS 2.0 base score of 7.8, rated high severity.
Is CVE-2015-0646 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 4% (89th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2015-0646?: CVE-2015-0646 primarily affects Cisco Ios Xe. In total, 36 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2015-0646?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2015-0646 published?: CVE-2015-0646 was published on 2015-03-26 and last updated on 2026-06-17.

References

Affected products (36)

cpe:2.3:o:cisco:ios_xe:3.3xo.0:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:3.3xo.1:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:3.3xo.2:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:3.5e.0:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:3.5e.1:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:3.5e.2:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:3.5e.3:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:3.6e.0:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:3.6e.1:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:3.8s.0:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:3.8s.1:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:3.8s.2:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:3.8s_base:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:3.9s.0:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:3.9s.1:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:3.9s.2:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:3.10s.0:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:3.10s.0a:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:3.10s.1:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:3.10s.2:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:3.10s.3:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:3.10s.4:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:3.11s.0:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:3.11s.1:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:3.11s.2:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:3.11s.3:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:3.11s.4:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:3.12s.0:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:3.12s.1:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.2:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.4:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.0:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.1:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.2:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.3:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.4:*:*:*:*:*:*:*

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