Security readout for executives and security teams
Plain-English summary
CVE-2021-1279 describes multiple Cisco SD-WAN denial-of-service vulnerabilities. An unauthenticated remote attacker could disrupt an affected device, potentially impacting WAN connectivity and business operations. The provided sources do not name specific affected versions or fixed releases.
Executive priority
Treat this as high priority where Cisco SD-WAN supports critical connectivity. The main risk is service disruption, not data theft. Act quickly on Cisco guidance, especially for externally reachable or operationally critical deployments.
Technical view
Cisco reports multiple SD-WAN DoS flaws with CVSS 3.1 score 8.6 and vector AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H. The weakness is mapped to CWE-119. Impact is availability loss only; confidentiality and integrity impacts are not indicated.
Likely exposure
Organizations using Cisco SD-WAN Solution may be exposed, but the source bundle lists affected versions as n/a. Exposure should be determined by matching deployed Cisco SD-WAN components and software releases against Cisco’s advisory.
Exploitation context
The CVE allows unauthenticated remote DoS according to Cisco and CVE metadata. The bundle does not provide exploit details, public exploitation evidence, or proof of active exploitation. It is not listed as CISA KEV in the provided data.
Researcher notes
Evidence is limited to CVE metadata and Cisco’s advisory reference. Affected versions and concrete remediation details are not present in the supplied bundle. Do not assume exploit availability or active exploitation without additional sourced evidence.
Mitigation direction
- Review Cisco’s advisory for affected releases and official remediation guidance.
- Inventory Cisco SD-WAN devices and software versions across production and edge environments.
- Prioritize vendor-recommended upgrades or mitigations for internet-reachable or business-critical devices.
- Monitor Cisco and CVE records for updated fixed-version or workaround details.
Validation and detection
- Confirm whether Cisco SD-WAN Solution is deployed in the environment.
- Compare device software versions against Cisco’s advisory once affected release details are confirmed.
- Review monitoring for unexplained SD-WAN device crashes, resets, or availability drops.
- Verify remediation status through configuration management or vulnerability management records.
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-119: 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-2021-1279 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
- 8.6 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/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:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H3.94Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
8.6HighVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
Source materials
- CVE List V5 sourceCVE List V5
- 20210120 Cisco SD-WAN Denial of Service VulnerabilitiesCVE 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 Restriction of Operations within the Bounds of a Memory Buffer
Improper Restriction of Operations within the Bounds of a Memory Buffer represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.