Security readout for executives and security teams
Plain-English summary
This flaw can let an unauthenticated network attacker crash and restart the DHCP server process in Cisco Prime Network Registrar. The main business impact is service disruption: clients may be unable to obtain or renew network addresses during outages.
Executive priority
Treat as high priority for networks dependent on Cisco Prime Network Registrar DHCP. The issue affects availability, not data theft, but DHCP disruption can create broad operational impact if production client networks depend on it.
Technical view
CVE-2020-3272 is an insufficient input validation issue in Cisco Prime Network Registrar's DHCP server. Crafted DHCP traffic can trigger a DHCP server process restart, causing denial of service. CVSS 3.0 is 7.5 with network attack vector, low complexity, no privileges, and high availability impact.
Likely exposure
Exposure is limited to Cisco Prime Network Registrar systems running the affected DHCP server and reachable by networks where an attacker can send DHCP traffic. The provided sources do not identify specific affected versions.
Exploitation context
The bundle does not show CISA KEV listing or evidence of active exploitation. The described exploit condition is unauthenticated crafted DHCP traffic causing process restart, but no weaponization details are provided here.
Researcher notes
Evidence is strongest for vulnerability class, attack preconditions, and impact from the CVE and Cisco advisory metadata. The provided bundle lacks affected version ranges, patch version details, workaround text, and exploitation telemetry.
Mitigation direction
- Review Cisco's advisory for affected releases and vendor-supported fixes.
- Apply Cisco-recommended software updates or mitigations where applicable.
- Restrict DHCP service exposure to intended client networks where operationally possible.
- Monitor DHCP service restarts and unexplained address assignment disruptions.
Validation and detection
- Inventory Cisco Prime Network Registrar deployments providing DHCP service.
- Check installed versions against Cisco's advisory and asset records.
- Confirm DHCP service reachability only from expected network segments.
- Review logs for DHCP server restarts or DoS symptoms.
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-2020-3272 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
- High
- CVSS
- 7.5 (3.0)
- Known Exploited
- No
- Published
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/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:L/PR:N/UI:N/S:U/C:N/I:N/A:H3.93.6Primary CVE scoreVulnerability scoring details
Base CVSS 3.0 score
7.5HighVector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source materials
- CVE List V5 sourceCVE List V5
- 20200520 Cisco Prime Network Registrar DHCP 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.
Improper Input Validation
Improper Input Validation represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.