Security readout for executives and security teams
Plain-English summary
CVE-2021-27630 can let an unauthenticated network attacker crash affected SAP NetWeaver ABAP or ABAP Platform Enqueue Server components. The reported impact is service unavailability only; the source says data cannot be viewed or modified. Business urgency depends on whether affected SAP kernel versions are reachable from untrusted networks.
Executive priority
Treat this as a high-priority availability risk for affected SAP environments, not a confidentiality breach. Prioritize externally reachable or business-critical SAP systems first, because exploitation could interrupt operations even without data theft or modification.
Technical view
The flaw is improper input validation in EnqConvUniToSrvReq(), mapped to CWE-476, affecting listed SAP KRNL/KERNEL variants for ABAP Enqueue Server. A specially crafted network packet can trigger an internal error and crash. CVSS 3.0 is 7.5, with network attack vector, low complexity, no privileges, no user interaction, and high availability impact.
Likely exposure
Exposure is most likely where affected SAP NetWeaver ABAP Server or ABAP Platform Enqueue Server kernel versions are deployed and reachable over the network. Internet or broad internal reachability increases operational risk, especially for SAP systems supporting critical business processes.
Exploitation context
The provided sources do not show CISA KEV listing or confirmed active exploitation. The CVE description states an unauthenticated attacker can cause a crash without specific system knowledge, but no public exploit status is established in the bundle.
Researcher notes
Evidence supports a denial-of-service condition caused by malformed network input reaching EnqConvUniToSrvReq(). The bundle does not include packet details, exploit maturity, or complete remediation text. Avoid assuming affected products beyond the listed SAP ABAP Enqueue Server kernel variants.
Mitigation direction
- Review and implement SAP Note 3020104 through official SAP support channels.
- Apply vendor-supported kernel updates or corrections identified by SAP guidance.
- Restrict Enqueue Server access to trusted SAP hosts and management networks.
- Monitor SAP availability and Enqueue Server crash or restart events.
- Prioritize remediation for production systems supporting critical business processes.
Validation and detection
- Inventory SAP ABAP kernel variants and versions against the affected version list.
- Confirm whether Enqueue Server interfaces are reachable from untrusted networks.
- Check SAP Note 3020104 for the corrected version or required action.
- Review SAP system logs for unexplained Enqueue Server crashes or restarts.
- Validate remediation in a non-production SAP environment before production rollout.
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-476: 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-2021-27630 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
- https://wiki.scn.sap.com/wiki/pages/viewpage.action?pageId=578125999CVE reference
- https://launchpad.support.sap.com/#/notes/3020104CVE 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.
NULL Pointer Dereference
NULL Pointer Dereference represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.