Security readout for executives and security teams
Plain-English summary
This flaw lets remote unauthenticated users bypass traffic charging or classification rules on affected Cisco ASR 5000 ECS deployments. It is not described as data theft or outage, but it can undermine billing, traffic policy enforcement, and revenue controls.
Executive priority
Prioritize as moderate where ASR 5000 ECS supports billing or policy enforcement. The main risk is revenue leakage or policy bypass, not system takeover. Confirm exposure before emergency action.
Technical view
CVE-2020-3244 is an insufficient input validation issue in Cisco ASR 5000 Series Software Enhanced Charging Service. Malformed HTTP traffic passing through an affected device can bypass ECS traffic classification rules, causing low integrity impact under CVSS 3.0 score 5.3.
Likely exposure
Exposure is limited to Cisco ASR 5000 Series Software deployments using Enhanced Charging Service for traffic classification or charging. Organizations without ASR 5000 ECS in the traffic path are not indicated as affected by the provided sources.
Exploitation context
The source bundle says exploitation is remote and unauthenticated with low attack complexity. It does not show CISA KEV listing or any cited evidence of active exploitation. Treat exploit activity as unconfirmed from the available evidence.
Researcher notes
Evidence is narrow: affected product, impact, CVSS, CWE-20, and Cisco advisory reference are provided. No patch details, exploit telemetry, or version list are included in the bundle, so validation should depend on Cisco advisory data and local configuration.
Mitigation direction
- Identify Cisco ASR 5000 systems running Enhanced Charging Service.
- Review the Cisco advisory for affected releases and vendor remediation guidance.
- Prioritize remediation where ECS drives billing or subscriber traffic policy enforcement.
- Monitor charging, classification, and policy logs for unexpected HTTP rule bypass patterns.
Validation and detection
- Inventory ASR 5000 software versions and ECS configuration status.
- Confirm whether ECS classifies HTTP subscriber traffic in production paths.
- Compare deployed software against Cisco advisory affected-release information.
- Review billing and traffic classification records for unexplained HTTP discrepancies.
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-20: 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-2020-3244 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
- 5.3 (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
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:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N3.91.4Primary CVE scoreVulnerability scoring details
Base CVSS 3.0 score
5.3MediumVector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Source materials
- CVE List V5 sourceCVE List V5
- 20200617 Cisco ASR 5000 Series Aggregation Services Routers Enhanced Charging Service Rule Bypass VulnerabilityCVE 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 Input Validation
Improper Input Validation represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.