Security readout for executives and security teams
Plain-English summary
CVE-2021-1458 is a medium-severity XSS issue in Cisco Firepower Management Center's web interface. An attacker must convince an interface user to click a crafted link. Successful exploitation could run script in that user's browser session or expose browser-accessible information.
Executive priority
Treat this as a planned security maintenance item, not an emergency, unless FMC is broadly exposed or administrators face targeted phishing risk.
Technical view
The source describes multiple CWE-79 vulnerabilities caused by insufficient validation of user-supplied input in Cisco FMC's web-based management interface. The CVSS 3.1 score is 4.8, with network attack vector, required user interaction, changed scope, and low confidentiality and integrity impact.
Likely exposure
Exposure is limited to organizations using Cisco Firepower Management Center. The bundle does not identify affected versions, so teams must map installed FMC versions against Cisco's advisory.
Exploitation context
The bundle provides no KEV listing and no cited evidence of active exploitation. Exploitation requires persuading a user of the FMC interface to open a crafted link.
Researcher notes
The bundle says unauthenticated remote attacker, while the CVSS vector includes PR:H; verify details in Cisco's advisory. No affected version list or fixed release details were provided in the bundle.
Mitigation direction
- Review Cisco's advisory for affected and fixed FMC releases.
- Upgrade or remediate according to Cisco's published guidance.
- Restrict FMC management access to trusted administrative networks.
- Warn FMC administrators about crafted links targeting management sessions.
Validation and detection
- Inventory Cisco Firepower Management Center deployments and versions.
- Compare installed versions against Cisco's advisory.
- Confirm FMC management interfaces are not broadly exposed.
- Review logs for unusual admin-session browser activity or unexpected interface requests.
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-79: User-session and phishing behavior lookup
Client-side and session-facing weaknesses should be reviewed alongside initial-access and user-execution behaviors. 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-2021-1458 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
- Medium
- CVSS
- 4.8 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N
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 vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N1.72.7Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
4.8MediumVector: CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N
Source materials
- CVE List V5 sourceCVE List V5
- 20210428 Cisco Firepower Management Center Software Cross-Site Scripting VulnerabilitiesCVE reference · vendor-advisory, x_refsource_CISCO
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 Input During Web Page Generation ('Cross-site Scripting')
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.