Security readout for executives and security teams
Plain-English summary
CVE-2020-3228 can let an unauthenticated remote attacker crash affected Cisco network devices by sending crafted SXP traffic. The business impact is service interruption, not data theft. The CVSS score is 6.8 because exploitation is network-reachable but rated high complexity.
Executive priority
Treat this as a moderate availability risk. It deserves planned remediation, especially for core, edge, or segmentation-critical Cisco devices, but the supplied evidence does not support emergency response based on active exploitation.
Technical view
The flaw is improper input handling in Cisco Security Group Tag Exchange Protocol across IOS, IOS XE, and NX-OS. Crafted SXP packets may be mishandled, causing device reload and denial of service. The CVE maps to CWE-20 and affects availability only in the provided CVSS vector.
Likely exposure
Exposure is most likely on Cisco devices running affected IOS, IOS XE, or NX-OS software with SXP enabled and reachable. The bundle specifically lists Cisco IOS 15.3(2)T, while the Cisco advisory should be used for the full affected-software matrix.
Exploitation context
The source bundle does not show CISA KEV listing or public active exploitation evidence. Exploitation is described as unauthenticated and remote, but high complexity. Impact is device reload and denial of service, which may disrupt routing, segmentation, or dependent services.
Researcher notes
Evidence is limited to the CVE record and Cisco advisory reference. Do not infer affected releases beyond vendor guidance. Validation should focus on SXP enablement, reachability, affected software, and operational importance rather than exploit reproduction.
Mitigation direction
- Check Cisco advisory for fixed software, workarounds, and affected release details.
- Prioritize remediation for SXP-enabled devices supporting critical network paths.
- Restrict untrusted network reachability to SXP where operationally possible.
- Review change windows for upgrades because remediation may affect network availability.
Validation and detection
- Inventory Cisco IOS, IOS XE, and NX-OS devices and software versions.
- Identify whether SXP is enabled on each potentially affected device.
- Confirm whether SXP is reachable from untrusted or broad network segments.
- Review device logs for unexplained reloads, without assuming exploitation.
- Compare findings against the Cisco advisory affected-version guidance.
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-2020-3228 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
- 6.8 (3.0)
- Known Exploited
- No
- Published
Vector: CVSS:3.0/AV:N/AC:H/PR:N/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:N/UI:N/S:C/C:N/I:N/A:H2.24Primary CVE scoreVulnerability scoring details
Base CVSS 3.0 score
6.8MediumVector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:N/A:H
Source materials
- CVE List V5 sourceCVE List V5
- 20200603 Cisco IOS, IOS XE, and NX-OS Software Security Group Tag Exchange Protocol 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.