How severe is CVE-2015-6429?

CVE-2015-6429 has a CVSS 2.0 base score of 5.0, rated medium severity.

Is CVE-2015-6429 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (75th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2015-6429?

CVE-2015-6429 primarily affects Cisco Ios. In total, 18 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2015-6429?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2015-6429 published?

CVE-2015-6429 was published on 2015-12-19 and last updated on 2026-06-17.

CVE-2015-6429

CVE-2015-6429 is a medium-severity vulnerability in Cisco Ios with a CVSS 2.0 base score of 5.0. 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-19.

Key facts

Severity: Medium (CVSS 2.0 base score 5.0)
EPSS exploit prediction: 2% (75th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-19
Affected product: Cisco Ios
Published: 2015-12-19
Last modified: 2026-06-17

Description

The IKEv1 state machine in Cisco IOS 15.4 through 15.6 and IOS XE 3.15 through 3.17 allows remote attackers to cause a denial of service (IPsec connection termination) via a crafted IKEv1 packet to a tunnel endpoint, aka Bug ID CSCuw08236.

Frequently asked questions

What is CVE-2015-6429?: The IKEv1 state machine in Cisco IOS 15.4 through 15.6 and IOS XE 3.15 through 3.17 allows remote attackers to cause a denial of service (IPsec connection termination) via a crafted IKEv1 packet to a tunnel endpoint, aka Bug ID CSCuw08236.
How severe is CVE-2015-6429?: CVE-2015-6429 has a CVSS 2.0 base score of 5.0, rated medium severity.
Is CVE-2015-6429 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (75th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2015-6429?: CVE-2015-6429 primarily affects Cisco Ios. In total, 18 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2015-6429?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2015-6429 published?: CVE-2015-6429 was published on 2015-12-19 and last updated on 2026-06-17.

References

Affected products (18)

cpe:2.3:o:cisco:ios:15.4\(3\)s:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.5\(1\)s:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.5\(1\)t:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.5\(2\)s:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.5\(2\)t:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.5\(3\)m:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.5\(3\)m1:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.5\(3\)s:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.5\(3\)s1:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.6\(0.17\)t:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.6\(1\)t0a:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:3.15s.0:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:3.15s.1:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:3.15s.2:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:3.16s.0:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:3.16s.1:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:3.17s.0:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:3.17s.1:*:*:*:*:*:*:*

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