How severe is CVE-2017-3850?

CVE-2017-3850 has a CVSS 3.x base score of 5.9, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2017-3850 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (83rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2017-3850?

CVE-2017-3850 primarily affects Cisco Ios. In total, 143 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2017-3850?

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

When was CVE-2017-3850 published?

CVE-2017-3850 was published on 2017-03-21 and last updated on 2026-06-17.

CVE-2017-3850

CVE-2017-3850 is a medium-severity vulnerability in Cisco Ios with a CVSS 3.x base score of 5.9. 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-20.

Key facts

Severity: Medium (CVSS 3.x base score 5.9)
CVSS v2: 7.1
EPSS exploit prediction: 2% (83rd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-20
Affected product: Cisco Ios
Published: 2017-03-21
Last modified: 2026-06-17

Description

A vulnerability in the Autonomic Networking Infrastructure (ANI) feature of Cisco IOS Software (15.4 through 15.6) and Cisco IOS XE Software (3.7 through 3.18, and 16) could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition. The vulnerability is due to incomplete input validation on certain crafted packets. An attacker could exploit this vulnerability by sending a crafted IPv6 packet to a device that is running a Cisco IOS Software or Cisco IOS XE Software release that supports the ANI feature. A device must meet two conditions to be affected by this vulnerability: (1) the device must be running a version of Cisco IOS Software or Cisco IOS XE Software that supports ANI (regardless of whether ANI is configured); and (2) the device must have a reachable IPv6 interface. An exploit could allow the attacker to cause the affected device to reload. Cisco Bug IDs: CSCvc42729.

Frequently asked questions

What is CVE-2017-3850?: A vulnerability in the Autonomic Networking Infrastructure (ANI) feature of Cisco IOS Software (15.4 through 15.6) and Cisco IOS XE Software (3.7 through 3.18, and 16) could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition. The vulnerability is due to incomplete input validation on certain crafted packets. An attacker could exploit this vulnerability by sending a crafted IPv6 packet to a device that is running a Cisco IOS Software or Cisco IOS XE Software release that supports the ANI feature. A device must meet two conditions to be affected by this vulnerability: (1) the device must be running a version of Cisco IOS Software or Cisco IOS XE Software that supports ANI (regardless of whether ANI is configured); and (2) the device must have a reachable IPv6 interface. An exploit could allow the attacker to cause the affected device to reload. Cisco Bug IDs: CSCvc42729.
How severe is CVE-2017-3850?: CVE-2017-3850 has a CVSS 3.x base score of 5.9, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2017-3850 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (83rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2017-3850?: CVE-2017-3850 primarily affects Cisco Ios. In total, 143 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2017-3850?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2017-3850 published?: CVE-2017-3850 was published on 2017-03-21 and last updated on 2026-06-17.

References

Affected products (143)

cpe:2.3:o:cisco:ios:15.2\(3\)e:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.2\(3\)e1:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.2\(3\)e2:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.2\(3\)e3:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.2\(4\)e:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.2\(4\)e1:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.2\(4\)e2:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.2\(5\)e:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.2\(5b\)e:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.3\(3\)s:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.3\(3\)s1:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.3\(3\)s2:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.3\(3\)s3:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.3\(3\)s4:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.3\(3\)s5:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.3\(3\)s6:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.4\(1\)s:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.4\(1\)s1:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.4\(1\)s2:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.4\(1\)s3:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.4\(1\)s4:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.4\(2\)s1:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.4\(2\)s2:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.4\(2\)s3:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.4\(2\)s4:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.4\(3\)s:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.4\(3\)s1:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.4\(3\)s2:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.4\(3\)s3:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.4\(3\)s4:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.4\(3\)s5:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.4\(3\)s6:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.5\(1\)s:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.5\(1\)s1:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.5\(1\)s2:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.5\(1\)s3:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.5\(1\)s4:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.5\(2\)s:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.5\(2\)s1:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.5\(2\)s2:*:*:*:*:*:*:*

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