ExploitedIn CISA KEV

CVE-2017-12232

Exploitation confirmed. First attested on 2022-03-03 by CISA-ADP, CISA KEV, GCVE · kevintel.

Published2017-09-29
WeaknessCWE-399

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

A vulnerability in the implementation of a protocol in Cisco Integrated Services Routers Generation 2 (ISR G2) Routers running Cisco IOS 15.0 through 15.6 could allow an unauthenticated, adjacent attacker to cause an affected device to reload, resulting in a denial of service (DoS) condition. The vulnerability is due to a misclassification of Ethernet frames. An attacker could exploit this vulnerability by sending a crafted Ethernet frame to an affected device. A successful exploit could allow the attacker to cause the affected device to reload, resulting in a DoS condition. Cisco Bug IDs: CSCvc03809.

Timeline

dates in UTC

2017-09-2901:34CVE publishedNVD
2022-03-03Added to the CISA KEV catalogCISA KEV
2022-03-03Listed as exploited by GCVEGCVE
2022-03-03Exploitation first reportedCISA KEV
2024-11-0817:34SSVC exploitation set to activeCISA-ADP

Observed activity

isMalicious corpus · updated 2026-10-23 18:48 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2017-12232?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2017-12232?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD

Cisco iosversion to verify

Branch	Affected	Fixed in	Source
15.x	≥ 15.0, ≤ 15.6	no fix published	NVD

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

CISA’s required action: Apply updates per vendor instructions.due 2022-03-24

Advisories and patches

tools.cisco.comVendor Advisory

Detection

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: none listed

CISA Known Exploited Vulnerability

Date Added: 2022-03-03
Patch Due Date: 2022-03-24
Ransomware Use: Unknown
Required Action: Apply updates per vendor instructions.

Sources

CISA KEVKEV entry2022-03-03
GCVEexploitation2022-03-03
CISA-ADPSSVC decisionactive2024-11-08
OpenCVESSVC decisionactive—
CISA-ADPCVSS 3.16.52024-11-08
NVDCVSS 3.16.5read 2026-10-23
NVDCVSS 2.06.1read 2026-10-23
CNAweakness (CWE)CWE-399read 2026-10-23
FIRST EPSSEPSS score2.2 %2026-10-22

Technical details

CVSS v3 Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published: 2017-09-29
Last Modified: 2026-06-17
NVD status: Analyzed

Frequently asked questions

What is CVE-2017-12232?

Is CVE-2017-12232 actively exploited?

Yes. CVE-2017-12232 is on the CISA Known Exploited Vulnerabilities (KEV) catalog, meaning it has been confirmed as actively exploited in the wild. CISA requires federal agencies to patch by 2022-03-24.

What is the CVSS score for CVE-2017-12232?

CVE-2017-12232 has a CVSS v3 base score of 6.5 (MEDIUM severity), with vector string CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

Hear about the next vulnerability in your software

Surveillance reads the versions in your stack — a domain, a lockfile or a list — checks each CVE against the ranges its sources publish, and alerts you when one you run is exploited or enters CISA KEV. A version it cannot read stays « version not verified ».

Get alerts for this product CISA KEV additions, March 2022 Search CVEs

No credit card required · No monthly cap on website lookups · 250 API requests/month

Go further

For a threat intelligence platform: malware, C2 and ransomware indicators over STIX/TAXII.
Following what attackers exploit right now? The CISA KEV additions of the month, with their patch deadlines.
Running this software? Vulnerability monitoring alerts you to new vulnerabilities in your products.

Related vulnerabilities

Same product first, then the same vendor advisory and the same publication week.

Back to CVE Database