Security readout for executives and security teams
Plain-English summary
This is a low-severity availability issue in libexpat. A specially crafted file around 2 MiB can make parsing take dozens of seconds. The sources do not indicate data theft, code execution, or confirmed active exploitation.
Executive priority
Handle through normal patch and dependency management unless a critical service parses untrusted XML at high volume. No source in the bundle supports emergency response.
Technical view
CVE-2025-66382 is categorized as CWE-407 inefficient algorithmic complexity in libexpat through 2.7.3. CVSS 3.1 is 2.9 with local attack vector, high complexity, no privileges, and low availability impact only.
Likely exposure
Exposure is most likely where applications or products use libexpat to parse untrusted XML or XML-like inputs. Embedded product exposure should be confirmed through vendor advisories, including the referenced Siemens notices.
Exploitation context
The provided CVE data says exploitation requires a crafted file and results in prolonged processing time. KEV is false, and the provided sources do not support active exploitation claims.
Researcher notes
The source bundle has limited technical detail and an inconsistent affected entry showing version 0 while the description says through 2.7.3. Treat exposure decisions as dependency-driven and vendor-confirmed.
Mitigation direction
- Inventory applications and products using libexpat.
- Check libexpat and vendor advisories for fixed versions or guidance.
- Prioritize systems parsing untrusted XML inputs.
- Apply vendor-provided updates when available.
- Use operational resource limits where appropriate for untrusted parsing paths.
Validation and detection
- Identify deployed libexpat versions in application and product inventories.
- Confirm whether any deployment processes untrusted XML files.
- Review Siemens advisories for affected product mappings.
- Track vendor guidance for remediation status.
- Monitor parsing services for unusual CPU time or latency spikes.
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-407: 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-2025-66382 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
- Low
- CVSS
- 2.9 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:L/AC:H/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.
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:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L1.41.4mitreVulnerability scoring details
Base CVSS 3.1 score
2.9LowVector: CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
Vulnerability timeline
Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.
- CVE publishedCVE Program
The CVE record was published.
- CVE reservedCVE Program
The CVE ID was reserved by the assigning CNA.
- 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
- https://github.com/libexpat/libexpat/issues/1076CVE reference, mitre
- https://cert-portal.siemens.com/productcert/html/ssa-082556.htmlCVE reference, siemens-SADP
- https://cert-portal.siemens.com/productcert/html/ssa-253495.htmlCVE reference, siemens-SADP
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.
Inefficient Algorithmic Complexity
Inefficient Algorithmic Complexity represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.