Security readout for executives and security teams
Plain-English summary
Cisco reports critical buffer overflow vulnerabilities in Cisco SD-WAN products. The public record says an unauthenticated remote attacker could attack an affected device, with potential confidentiality, integrity, and availability impact. The provided data does not identify affected versions or a specific patch level.
Executive priority
Treat this as urgent for any Cisco SD-WAN environment. Prioritize asset confirmation and vendor-guided remediation because the vulnerability is critical, remotely reachable, and potentially impacts core network control infrastructure.
Technical view
CVE-2021-1300 covers Cisco SD-WAN buffer overflow vulnerabilities mapped to CWE-119. The CVSS 3.0 score is 9.8, with network access, low attack complexity, no privileges, and no user interaction required. Source details provided here do not include product-version granularity or exploit mechanics.
Likely exposure
Exposure is most relevant to organizations running Cisco SD-WAN Solution components. The bundle lists versions as n/a, so teams must map their deployed Cisco SD-WAN assets against Cisco’s advisory rather than relying on the CVE record alone.
Exploitation context
The source bundle does not show CISA KEV listing or cited evidence of active exploitation. The risk is still high because the CVSS vector indicates unauthenticated remote reachability and full confidentiality, integrity, and availability impact.
Researcher notes
The provided sources are sparse: affected versions are not enumerated, and no exploitation evidence is cited. Research should start with Cisco’s advisory details, then validate local product versions and exposure paths without assuming unsupported affected ranges.
Mitigation direction
- Review Cisco’s advisory for affected releases and fixed software guidance.
- Inventory Cisco SD-WAN assets and identify deployed versions.
- Apply Cisco-recommended updates or workarounds where the advisory confirms applicability.
- Reduce unnecessary network exposure for affected SD-WAN services pending remediation.
Validation and detection
- Compare each Cisco SD-WAN deployment against Cisco’s affected-product guidance.
- Confirm remediation status against Cisco’s fixed-release or workaround instructions.
- Check whether internet-accessible Cisco SD-WAN interfaces exist in your environment.
- Review monitoring for unusual activity against affected SD-WAN devices.
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-2021-1300 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
- Critical
- CVSS
- 9.8 (3.0)
- Known Exploited
- No
- Published
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/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:H/I:H/A:H3.95.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.0 score
9.8CriticalVector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source materials
- CVE List V5 sourceCVE List V5
- 20210120 Cisco SD-WAN Buffer Overflow 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.