CVE-2017-12240

Exploitation

Exploited in the wild. Listed in the CISA Known Exploited Vulnerabilities catalog on 2022-03-03. Federal remediation due 2022-03-24.

SSVC decision

• ExploitationactiveCISA reports credible evidence of active exploitation.
• AutomatableyesAn attacker can reliably automate reconnaissance through exploitation, so this scales.
• Technical ImpacttotalSuccessful exploitation gives total control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

13.88% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 96.2% of scored records. A rank, not a probability.

NVD base score

9.8 (CVSS v3.x), scored by the NVD independently of the CNA.

NVD CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

NVD analysis status

Analyzed. NVD last modified this record on 2026-06-17.

Red Hat severity

No Red Hat rating. Red Hat rates the CVEs that affect its products.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

Published

2017-09-28 07:00Z8 YR AGO

Last updated

2026-01-12 21:47Z7 MO AGO

Reserved

2017-08-03

Assigning CNA

cisco

Record state

PUBLISHED

Severity

Critical (CVSS 9.8)

CNA CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Weaknesses

• CWE-20Improper Input ValidationClass
• CWE-119Improper Restriction of Operations within the Bounds of a Memory BufferClass

Data version

5.2

Document digest

6315e4e3c2a6d43ef2bf327c2255516c1fb69450988d6e15c12bcaaf30b9c518

• quickview.cloudapps.cisco.comhttps://quickview.cloudapps.cisco.com/quickview/bug/CSCuw77959x_refsource_CONFIRM
• quickview.cloudapps.cisco.comhttps://quickview.cloudapps.cisco.com/quickview/bug/CSCsm45390x_refsource_CONFIRM
• www.securityfocus.com101034http://www.securityfocus.com/bid/101034vdb-entryx_refsource_BID
• tools.cisco.comhttps://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170927-dhcpx_refsource_CONFIRM
• www.securitytracker.com1039445http://www.securitytracker.com/id/1039445vdb-entryx_refsource_SECTRACK
• www.cisa.govhttps://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2017-12240government-resource