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CVE Record

CVE-2020-3307: Cisco Firepower Management Center Arbitrary Log File Write Vulnerability

A vulnerability in the web UI of Cisco Firepower Management Center (FMC) Software could allow an unauthenticated, remote attacker to write arbitrary entries to the log file on an affected device. The vulnerability is due to insufficient input validation. An attacker could exploit this vulnerability by sending a crafted HTTP request to an affected device. A successful exploit could allow the attacker to send incorrect information to the system log on the affected system.

MediumCVSS 5.3Not KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

CVE-2020-3307 lets an unauthenticated remote attacker place false entries into Cisco Firepower Management Center system logs through the web UI. The cited impact is log integrity, not data theft or service disruption. Business urgency is moderate because misleading logs can undermine investigations, alert triage, and audit trails.

Executive priority

Treat as a moderate-priority remediation item, especially where FMC supports incident response, compliance reporting, or security operations. Prioritize internet-exposed or broadly reachable management interfaces first.

Technical view

The vulnerability is insufficient input validation in Cisco FMC Software web UI. A crafted HTTP request can write arbitrary entries to the affected device log file. CVSS 3.0 is 5.3: network exploitable, low complexity, no privileges, no user interaction, unchanged scope, low integrity impact only.

Likely exposure

Exposure is likely limited to organizations running Cisco Firepower Management Center with its web UI reachable by untrusted networks. The bundle does not specify affected version ranges, CPEs, or deployment prerequisites beyond Cisco FMC Software.

Exploitation context

The bundle describes remote unauthenticated exploitation via crafted HTTP request. It does not cite public exploit use, proof-of-concept availability, or active exploitation. KEV status is false, so active exploitation should not be assumed from these sources.

Researcher notes

Root cause is CWE-20 insufficient input validation. The stated security impact is insertion of incorrect information into system logs. The source bundle does not provide affected version ranges, fixed versions, workaround details, or exploit artifacts.

Mitigation direction

  • Restrict FMC web UI access to trusted administrative networks and VPNs.
  • Check Cisco's advisory for affected and fixed FMC releases, then plan upgrade.
  • Monitor FMC system logs for suspicious or inconsistent entries.
  • Corroborate critical security events with external, tamper-resistant logging sources.

Validation and detection

  • Confirm whether Cisco Firepower Management Center is deployed.
  • Check whether the FMC web UI is reachable from untrusted networks.
  • Match installed FMC software versions against Cisco advisory data.
  • Review log-monitoring workflows for reliance on unauthenticated FMC log entries alone.
Prepared
Confidence
high
Sources
3

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

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

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cwe · low confidence lookup

CWE-20: Exact CWE lookup

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cve · low confidence lookup

CVE-2020-3307 mapping review

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Vulnerability profileCVE Program record
Severity
Medium
CVSS
5.3 (3.0)
Known Exploited
No
Published

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Official CVE source material

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.

1CVSS vectors
0Timeline events
0ADP providers
2Source links

CVSS vector scores

1 official score

We 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.

ScoreVersionSeverityVectorExploitImpactSource
5.3CVSS 3.0MediumCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N3.91.4Primary CVE score

Vulnerability scoring details

Base CVSS 3.0 score

5.3Medium
CVSS 3.0 vector shape for CVE-2020-3307Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Privileges Required
NoneLowHigh
User Interaction
NoneRequired
Scope
ChangedUnchanged
Confidentiality Impact
HighLowNone
Integrity Impact
HighLowNone
Availability Impact
HighLowNone

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
CiscoCisco Firepower Management Centern/aListed
Weakness

CWE details

CWE-20

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.