Security readout for executives and security teams
Plain-English summary
This CVE affects ok-file-formats through 2018-10-16. A specially crafted input handled by ok_mo_decode2 can trigger a heap buffer over-read, potentially exposing memory or disrupting applications that parse untrusted files with this code.
Executive priority
Prioritize if the organization uses this library in products or services that parse untrusted files. The impact rating is high, but urgency is lower where there is no embedded use or no attacker-controlled input path.
Technical view
CVE-2018-20618 is a CWE-125 heap-based buffer over-read in ok_mo_decode2 in ok_mo.c. The CVSS 3.1 score is 8.8 with network attack vector, low complexity, no privileges required, and user interaction required.
Likely exposure
Exposure is most likely in applications that embed vulnerable ok-file-formats code and process attacker-controlled or externally supplied inputs through ok_mo_decode2. The provided record does not include CPEs or named downstream products.
Exploitation context
The source bundle does not show CISA KEV listing or cited evidence of active exploitation. The CVSS vector indicates user interaction is required, so risk depends on whether users or services process untrusted files with affected code.
Researcher notes
The public metadata is sparse: affected vendor/product fields are n/a, and the bundle names only the function and upstream issue. Validate exposure by code provenance and parser reachability rather than package inventory alone.
Mitigation direction
- Inventory any embedded ok-file-formats code or vendored copies.
- Check the upstream repository and vendor guidance for fixed code or advisories.
- Avoid processing untrusted inputs with affected ok_mo_decode2 code until remediated.
- Apply compensating controls around file ingestion and parsing paths.
Validation and detection
- Search codebases for ok_mo_decode2, ok_mo.c, or vendored ok-file-formats.
- Confirm whether the embedded snapshot is through 2018-10-16.
- Identify all public, email, upload, or API paths that parse affected inputs.
- Review crash reports or sanitizer findings for heap over-read symptoms in this parser.
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-2018-20618 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
- 8.8 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/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:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H2.85.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
8.8HighVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/brackeen/ok-file-formats/issues/6CVE reference · x_refsource_MISC
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.