Security readout for executives and security teams
Plain-English summary
CVE-2021-41229 is a BlueZ Bluetooth stack memory leak. A nearby attacker could repeatedly interact with SDP handling and make the target service consume memory until it crashes. This is mainly an availability issue, not a data theft or privilege escalation issue.
Executive priority
Treat this as a moderate availability risk. Prioritize patching for Bluetooth-enabled servers, kiosks, appliances, industrial endpoints, and mobile Linux devices where service crashes could affect operations. Lower priority applies where Bluetooth is disabled or physically inaccessible.
Technical view
Affected BlueZ 5.58 leaks memory in sdp_cstate_alloc_buf because allocated buffers remain attached to the cstates singly linked list and are not freed. Large repeated SDP traffic can grow memory use over time and crash the service. CVSS 3.1 is 4.3, AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L.
Likely exposure
Exposure is most likely on Linux or embedded systems running BlueZ 5.58 with Bluetooth enabled and SDP reachable from nearby Bluetooth range. NetApp and Debian advisories show downstream ecosystem relevance, but the source bundle does not identify specific NetApp products or every affected distribution package.
Exploitation context
The source bundle does not show CISA KEV listing or active exploitation. Exploitation requires adjacent Bluetooth reachability, no privileges, and no user interaction. The practical impact is service instability or crash through memory exhaustion, not confidentiality or integrity compromise.
Researcher notes
The available evidence supports a resource-consumption flaw in BlueZ 5.58 with adjacent-network attack vector. The bundle does not provide exploit status, fixed upstream version, or complete downstream product mapping, so validation should rely on vendor package advisories and local version inventory.
Mitigation direction
- Identify systems running BlueZ 5.58 or vendor packages derived from it.
- Apply BlueZ security updates from the operating system or appliance vendor.
- Disable Bluetooth where it is not operationally required.
- Restrict physical and radio proximity to sensitive Bluetooth-enabled assets.
- Review Debian, NetApp, and vendor advisories for product-specific guidance.
Validation and detection
- Inventory Linux, appliance, and embedded assets that include BlueZ.
- Confirm installed BlueZ package versions against vendor security advisories.
- Verify whether Bluetooth and SDP services are enabled on exposed devices.
- Check service logs for unexplained Bluetooth crashes or memory pressure.
- Confirm updated packages are deployed through normal patch compliance evidence.
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-400: Exact CWE lookup
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Open ATT&CK lookupCVE-2021-41229 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
- 4.3 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
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:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L2.81.4Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
4.3MediumVector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/bluez/bluez/security/advisories/GHSA-3fqg-r8j5-f5xqCVE reference
- [debian-lts-announce] 20211127 [SECURITY] [DLA 2827-1] bluez security updateCVE reference · mailing-list
- https://security.netapp.com/advisory/ntap-20211203-0004/CVE reference
- [debian-lts-announce] 20221024 [SECURITY] [DLA 3157-1] bluez security updateCVE reference · mailing-list
- https://lists.debian.org/debian-lts-announce/2024/09/msg00022.htmlCVE reference
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.
Uncontrolled Resource Consumption
Uncontrolled Resource Consumption represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.