Security readout for executives and security teams
Plain-English summary
This flaw can let an unauthenticated remote attacker bypass Cisco Snort-based HTTP file policy controls. If exploited, files that should have been blocked could pass through inspection and deliver a malicious payload. The business concern is reduced effectiveness of network security controls, not confirmed system takeover from this CVE alone.
Executive priority
Treat as a moderate-priority control-bypass issue. It should be scheduled for remediation based on where Cisco Snort-based inspection protects critical or exposed networks, especially if HTTP file policy is a key malware-prevention layer.
Technical view
CVE-2021-1494 is a CWE-693 protection-mechanism failure in the Snort detection engine. Incorrect handling of specific HTTP header parameters can allow crafted HTTP packets to bypass configured HTTP file policies on affected Cisco products. CVSS 3.1 is 5.8, with network attack vector, low complexity, no privileges, and low integrity impact.
Likely exposure
Exposure is most likely where Cisco Firepower Threat Defense Software or Cisco UTD SNORT IPS Engine Software inspects HTTP traffic and enforces file policies. The bundle lists many Cisco UTD SNORT IPS versions and marks Firepower Threat Defense versions as N/A, so exact deployment mapping requires Cisco advisory review.
Exploitation context
The source bundle does not show CISA KEV listing or cited evidence of active exploitation. Exploitation is described as remote and unauthenticated, requiring crafted HTTP packets through an affected device. The impact is bypassing configured HTTP file policy and potentially delivering a malicious payload.
Researcher notes
The bundle supports policy bypass, not confirmed code execution, data theft, or availability impact. Firepower Threat Defense affected versions are not specified in the provided data. Do not assume exploit maturity beyond the remote unauthenticated scenario described by the CVE sources.
Mitigation direction
- Review Cisco advisory cisco-sa-http-fp-bp-KfDdcQhc for vendor-approved fixed releases or workarounds.
- Inventory Cisco Firepower Threat Defense and Cisco UTD SNORT IPS Engine deployments.
- Prioritize devices enforcing HTTP file policies on internet-facing or high-risk traffic paths.
- Avoid relying on HTTP file policy as the only malware delivery control.
- Monitor Cisco sources for any updated exploitation or remediation guidance.
Validation and detection
- Confirm whether Cisco FTD or UTD SNORT IPS Engine is deployed in HTTP inspection paths.
- Compare deployed Cisco UTD SNORT IPS versions against the affected versions in the CVE bundle.
- Identify configured HTTP file policies whose bypass would materially increase malware delivery risk.
- Check whether remediation status matches the Cisco advisory guidance.
- Review security monitoring for unexpected allowed HTTP file transfers through affected devices.
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-693: 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-2021-1494 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
- 5.8 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/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:N/UI:N/S:C/C:N/I:L/A:N3.91.4Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
5.8MediumVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N
Source materials
- CVE List V5 sourceCVE List V5
- cisco-sa-http-fp-bp-KfDdcQhcCVE reference
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.
Protection Mechanism Failure
Protection Mechanism Failure represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.