Security readout for executives and security teams
Plain-English summary
This issue affects Cisco Small Business managed switches and targets the web management interface. An attacker could manipulate web responses so a switch administrator's browser runs attacker-controlled script or exposes browser-based information. The sources do not show active exploitation.
Executive priority
Treat this as a targeted management-plane risk, not confirmed mass exploitation. Prioritize inventory, firmware validation, and management interface restriction for affected Cisco switches.
Technical view
CVE-2017-12308 is a CWE-113 HTTP response splitting flaw in the web framework of affected Cisco Small Business 300 and 500 Series Managed Switches. It stems from insufficient validation of parameters passed to the web server. Exploitation requires a malicious link or request interception/injection against a web interface user.
Likely exposure
Exposure is most likely where affected Cisco 300/500 Series switch web interfaces are used for administration, especially if reachable from untrusted networks or managed over interceptable paths.
Exploitation context
The bundle says KEV is false and provides no cited evidence of active exploitation. The described attack depends on a user following a malicious link or an attacker intercepting and modifying a user request.
Researcher notes
Do not treat this as unauthenticated device takeover based on the provided sources. The impact is browser-context script execution or browser-based information exposure against a web interface user. Patch specifics are not present in the bundle; rely on Cisco guidance.
Mitigation direction
- Review Cisco advisory for affected releases and vendor-recommended fixes.
- Update affected switch software according to Cisco guidance where available.
- Restrict web management access to trusted admin networks or VPN paths.
- Avoid administering switches through untrusted or interceptable network paths.
- Limit administrative browsing to known, trusted switch management URLs.
Validation and detection
- Inventory Cisco Small Business 300 and 500 Series managed switches.
- Identify exact product family and software version for each device.
- Compare versions and models against Cisco advisory coverage.
- Confirm management web interfaces are not exposed to untrusted networks.
- Check whether administrators access these interfaces over trusted paths.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-113: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2017-12308 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS and timeline data
No CVSS vectors or timeline events were available in the normalized CVE source material.
Source materials
- CVE List V5 sourceCVE List V5
- https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180117-300-500-smb2CVE reference · x_refsource_CONFIRM
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Improper Neutralization of CRLF Sequences in HTTP Headers ('HTTP Request/Response Splitting')
Improper Neutralization of CRLF Sequences in HTTP Headers ('HTTP Request/Response Splitting') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.