Security readout for executives and security teams
Plain-English summary
CVE-2021-27606 can let an unauthenticated network attacker crash affected SAP NetWeaver ABAP or ABAP Platform Enqueue Server components. The reported impact is availability only: sources say attackers cannot view or modify data. For businesses, the concern is SAP service disruption where vulnerable Enqueue Server versions remain reachable.
Executive priority
Treat as a high-priority availability risk for SAP-dependent business processes. It does not indicate data theft or modification, but an unauthenticated crash condition can still interrupt finance, logistics, HR, or other SAP-backed operations.
Technical view
Affected SAP kernel and Enqueue Server variants mishandle input in EncOAMParamStore(). A specially crafted network packet can trigger an internal error and crash the system. The CVSS 3.0 score is 7.5, driven by network reachability, low complexity, no privileges, no user interaction, and high availability impact.
Likely exposure
Exposure is most likely in SAP NetWeaver ABAP Server or ABAP Platform environments running the listed KRNL32NUC, KRNL64NUC, KRNL64UC, or KERNEL versions, especially where Enqueue Server network access is not tightly restricted.
Exploitation context
The source bundle does not show CISA KEV listing or other cited evidence of active exploitation. The vulnerability is still operationally important because it is unauthenticated, network reachable, and can crash affected SAP systems.
Researcher notes
Evidence is strongest for denial of service via improper input validation in EncOAMParamStore(), mapped to CWE-125 in the bundle. Public details in the provided sources do not establish exploit-in-the-wild activity or give complete remediation specifics beyond SAP Note 3020104.
Mitigation direction
- Review and apply SAP Security Note 3020104 through SAP support channels.
- Update affected SAP kernel and Enqueue Server components per SAP guidance.
- Restrict Enqueue Server network access to trusted SAP hosts only.
- Monitor SAP guidance for version-specific corrections and prerequisites.
- Prioritize availability monitoring for critical SAP services.
Validation and detection
- Inventory SAP NetWeaver ABAP and ABAP Platform kernel versions.
- Compare running KRNL32NUC, KRNL64NUC, KRNL64UC, and KERNEL versions against the affected list.
- Confirm SAP Note 3020104 is implemented where applicable.
- Verify Enqueue Server access controls limit untrusted network reachability.
- Review operational history for unexplained Enqueue Server crashes.
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-125: 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-2021-27606 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.
Out-of-bounds Read
Out-of-bounds Read represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.