Security readout for executives and security teams
Plain-English summary
A flaw in Azure Functions may let an already-authorized attacker run code remotely because cryptographic signatures are not properly verified. Successful exploitation could compromise sensitive data, alter workloads, and disrupt service. Exploitation requires elevated access and high attack complexity, which reduces—but does not remove—business risk.
Executive priority
Prioritize prompt scope confirmation and remediation because successful exploitation could fully compromise affected workloads. Immediate emergency action is not supported by the supplied evidence, but uncertainty about affected versions warrants timely inventory and vendor-guidance review.
Technical view
CVE-2025-33074 is a CWE-347 signature-verification weakness in Microsoft Azure Functions. It is network-accessible, requires low privileges, no user interaction, and high attack complexity. Successful exploitation can cause high confidentiality, integrity, and availability impact. The supplied CVSS 3.1 score is 7.5.
Likely exposure
Potential exposure is limited to affected Azure Functions deployments where an attacker has authorized access and can satisfy unspecified high-complexity conditions. The source bundle does not identify affected versions, configurations, hosting plans, or application runtimes, so exposure cannot be determined from version inventory alone.
Exploitation context
The supplied CVSS vector reports proof-of-concept exploit maturity, but the bundle provides no supporting exploit details. The CVE is not listed as KEV, and no cited source establishes active exploitation. Treat active exploitation as unconfirmed.
Researcher notes
The central issue is improper cryptographic-signature verification under CWE-347. Important technical details—including the affected component, trust boundary, accepted signature condition, exact versions, and detection artifacts—are absent from the bundle. Validation should remain defensive and follow Microsoft guidance; the available evidence is insufficient for a reliable exploitability assessment.
Mitigation direction
- Review Microsoft's CVE advisory for the affected scope and current remediation instructions.
- Apply the Microsoft-provided update or remediation identified in the vendor advisory.
- Restrict Azure Functions administrative and deployment access using least privilege.
- Revoke unnecessary credentials and review authorized identities with deployment capabilities.
Validation and detection
- Inventory Azure Functions applications, subscriptions, hosting plans, and deployment methods.
- Compare each deployment with the affected scope published in Microsoft's advisory.
- Confirm Microsoft's prescribed update or remediation is applied across all relevant environments.
- Review authorized identities and recent deployment activity for unexpected changes.
- Verify applications operate normally after remediation and security controls remain enforced.
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-347: 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 lookupExecution behavior lookup
The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2025-33074 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 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C
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.
SSVC decision data
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:H/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C1.65.9microsoftVulnerability scoring details
Base CVSS 3.1 score
7.5HighVector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C
Vulnerability timeline
Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.
- CVE reservedCVE Program
The CVE ID was reserved by the assigning CNA.
- CVE publishedCVE Program
The CVE record was published.
- CVE updatedCVE Program
The CVE record metadata indicates this as the latest update time.
ADP provider summaries
Source materials
- CVE List V5 sourceCVE List V5
- Azure Functions Remote Code Execution VulnerabilityCVE reference, microsoft · vendor-advisory, patch
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 Verification of Cryptographic Signature
Improper Verification of Cryptographic Signature represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.