Security readout for executives and security teams
Plain-English summary
RealTerm Serial Terminal has a local buffer overflow issue that can allow code execution if a user pastes malicious content into the Echo Port Port field and clicks Change. This mainly affects workstations or lab/engineering systems where RealTerm is installed. Public exploit information exists, but the provided sources do not show active exploitation.
Executive priority
Treat as high priority for environments using RealTerm, particularly operational technology, lab, and engineering teams. The issue is not remotely exploitable based on provided evidence, but public exploit availability and code-execution impact justify prompt inventory, containment, and vendor-guidance review.
Technical view
CVE-2019-25679 is a CWE-787 out-of-bounds write/SEH buffer overflow in RealTerm Serial Terminal. The bundle describes version 2.0.0.70, while the affected entry lists 1.11.2, so version scope is inconsistent. Exploitation is local, low complexity, requires user interaction, and can impact confidentiality, integrity, and availability of the local system.
Likely exposure
Exposure is limited to systems with vulnerable RealTerm installed, especially engineering, serial-device testing, industrial support, and lab workstations. Network-facing exposure is not indicated. Business risk increases where users handle untrusted files, instructions, or pasted configuration values.
Exploitation context
A public ExploitDB entry is cited, indicating exploit details are publicly available. The CVSS vector requires local access and user interaction. CISA KEV status is false in the provided bundle, and no cited source confirms active exploitation in the wild.
Researcher notes
The source bundle contains a version inconsistency: title and description name 2.0.0.70, while the affected list names 1.11.2. Avoid expanding affected scope without vendor or CNA clarification. No patch is identified in the supplied sources. Do not claim active exploitation absent KEV or corroborating reporting.
Mitigation direction
- Inventory RealTerm installations and identify exact versions in use.
- Check RealTerm and SourceForge project guidance for a fixed release or vendor recommendation.
- Remove RealTerm where it is not operationally required.
- Restrict use to trusted inputs and controlled workstations until remediation is confirmed.
- Apply endpoint controls to reduce impact of local code execution.
Validation and detection
- Confirm whether RealTerm is installed on managed endpoints.
- Record installed RealTerm versions and compare against cited affected versions.
- Review endpoint telemetry for unexpected RealTerm crashes or child processes.
- Verify remediation by confirming removal or documented vendor-approved version change.
- Track the version-scope discrepancy during vulnerability management review.
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-787: 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-2019-25679 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
- 8.5 (4.0)
- Known Exploited
- No
- Published
Vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
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:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N——Primary CVE scoreVulnerability scoring details
Base CVSS 4.0 score
8.5HighVector: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Source materials
- CVE List V5 sourceCVE List V5
- ExploitDB-46441CVE reference · exploit
- Official Product HomepageCVE reference · product
- Product ReferenceCVE reference · product
- VulnCheck Advisory: RealTerm Serial Terminal 2.0.0.70 Buffer Overflow SEHCVE reference · third-party-advisory
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 Write
Out-of-bounds Write represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.