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CVE-2016-6415

Cisco IOS, IOS XR, and IOS XE IKEv1 Information Disclosure

7.5 HIGHActively exploited (CISA KEV)EPSS 87.7%
  1. Published18 Sept 2016
  2. Added to CISA KEV19 May 2023
  3. Remediation due9 Jun 2023
Actively exploited (CISA KEV)

Cisco IOS, IOS XR, and IOS XE contain insufficient condition checks in the part of the code that handles Internet Key Exchange version 1 (IKEv1) security negotiation requests. contains an information disclosure vulnerability in the Internet Key Exchange version 1 (IKEv1) that could allow an attacker to retrieve memory contents. Successful exploitation could allow the attacker to retrieve memory contents, which can lead to information disclosure.

Added to KEV: 19 May 2023Federal remediation due: 9 Jun 2023

Description

The server IKEv1 implementation in Cisco IOS 12.2 through 12.4 and 15.0 through 15.6, IOS XE through 3.18S, IOS XR 4.3.x and 5.0.x through 5.2.x, and PIX before 7.0 allows remote attackers to obtain sensitive information from device memory via a Security Association (SA) negotiation request, aka Bug IDs CSCvb29204 and CSCvb36055 or BENIGNCERTAIN.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityNone
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Affected products

Cisco iOS≥ 12.2 ≤ 12.4 · ≥ 15.0 ≤ 15.6
Cisco iOS XE≤ 3.18s
Cisco iOS XR≥ 4.3.0 ≤ 4.3.4 · ≥ 5.0.0 < 5.3.0

Remediation

Fixed in
Cisco iOS XR≥ 5.3.0

References

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Frequently asked

Is CVE-2016-6415 being actively exploited?

Yes. CVE-2016-6415 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added 19 May 2023.

How severe is CVE-2016-6415?

CVE-2016-6415 has a CVSS 3.1 base score of 7.5, rated high. EPSS estimates a 87.7% probability of exploitation.

Which products are affected by CVE-2016-6415?

Affected products include Cisco iOS, Cisco iOS XE, Cisco iOS XR.

How do I fix CVE-2016-6415?

Upgrade affected software to a fixed version, for example Cisco iOS XR 5.3.0 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2016-6415 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. Because it is on the CISA KEV list, Secuno flags any affected asset as top-priority automatically. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.