Security readout for executives and security teams
Plain-English summary
CVE-2020-3232 can let an authenticated remote user crash a specific Cisco ASR 920 router model through SNMP requests for Cisco Discovery Protocol data. The business impact is service interruption: the affected device may reload, creating a denial-of-service condition.
Executive priority
Prioritize if these routers support customer, WAN, or carrier aggregation paths. The vulnerability requires authenticated SNMP access and is not KEV-listed, but a reload of aggregation infrastructure can still create material outage risk.
Technical view
The issue is in SNMP handling on Cisco ASR 920 model ASR920-12SZ-IM. Incorrect handling of returned Cisco Discovery Protocol query data can trigger a device reload. The CVSS 3.0 score is 6.3, with network access, high attack complexity, low privileges, no user interaction, and high availability impact.
Likely exposure
Exposure is most likely where ASR920-12SZ-IM routers have SNMP enabled and reachable by users or systems with valid SNMP access. The source bundle does not identify affected software versions or other models.
Exploitation context
The sources describe an authenticated remote attack path but do not cite public exploitation or inclusion in CISA KEV. Treat this as a credible availability risk, not as confirmed active exploitation.
Researcher notes
Keep validation non-destructive. The evidence supports SNMP-triggered reload via CDP information queries on ASR920-12SZ-IM, but the bundle lacks detailed fixed-version data, workaround text, and exploit-observed telemetry.
Mitigation direction
- Check Cisco advisory for affected releases and fixed software guidance.
- Restrict SNMP access to trusted management hosts and networks.
- Review and remove unnecessary SNMP users, communities, or integrations.
- Disable SNMP or CDP-related polling where operationally unnecessary.
- Prioritize upgrades or compensating controls for exposed ASR920-12SZ-IM routers.
Validation and detection
- Inventory Cisco ASR 920 routers and confirm any ASR920-12SZ-IM models.
- Determine whether SNMP is enabled and remotely reachable.
- Review SNMP credentials, communities, and allowed source addresses.
- Compare installed software against Cisco advisory guidance.
- Check device logs for unexplained reloads around SNMP polling activity.
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
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Open ATT&CK lookupCVE-2020-3232 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
- 6.3 (3.0)
- Known Exploited
- No
- Published
Vector: CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:C/C:N/I:N/A:H
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:H/PR:L/UI:N/S:C/C:N/I:N/A:H1.84Primary CVE scoreVulnerability scoring details
Base CVSS 3.0 score
6.3MediumVector: CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:C/C:N/I:N/A:H
Source materials
- CVE List V5 sourceCVE List V5
- 20200603 Cisco ASR 920 Series Aggregation Services Router Model 12SZ-IM SNMP Denial of Service 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.
Data Processing Errors
Data Processing Errors represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.