Security readout for executives and security teams
Plain-English summary
RealTerm Serial Terminal 2.0.0.70 can be crashed through malformed input in its Echo Port/Port field. The documented impact is denial of service to the local application, not system takeover. This matters most where RealTerm is used for operational serial-device workflows and downtime disrupts testing, diagnostics, or industrial support tasks.
Executive priority
Treat this as a targeted availability risk, not an enterprise-wide emergency. Prioritize environments where RealTerm supports time-sensitive serial-device operations. Remediation should focus on inventory, removal of unnecessary installs, and migration away from the affected version when vendor guidance or newer builds are confirmed.
Technical view
The issue is a stack-based buffer overflow/SEH chain corruption in RealTerm Serial Terminal 2.0.0.70, mapped to CWE-787. The provided CVSS v4.0 score is 6.9 with local attack vector and high vulnerable-system availability impact. Public exploit information exists, but the supplied sources do not show active exploitation.
Likely exposure
Exposure is likely limited to endpoints where RealTerm Serial Terminal 2.0.0.70 is installed and usable by local users. The sources identify only version 2.0.0.70 as affected. Network-facing exposure is not indicated by the provided CVSS vector or advisory summary.
Exploitation context
An attacker needs local interaction with the application input field to trigger a crash. A public Exploit-DB reference exists, so proof-of-concept details are publicly available. CISA KEV status is false in the source bundle, and no cited source confirms exploitation in the wild.
Researcher notes
The source bundle names RealTerm Serial Terminal 2.0.0.70 only. Impact is application crash via SEH corruption in the Echo Port/Port field. No patch status is provided in the sources. Avoid assuming remote reachability, privilege escalation, or code execution beyond the documented denial-of-service behavior.
Mitigation direction
- Identify and prioritize systems running RealTerm Serial Terminal 2.0.0.70.
- Check RealTerm project pages and vendor guidance for fixed or newer builds.
- Upgrade or replace affected installations if a safe supported version is available.
- Restrict use to trusted local users on systems where RealTerm is required.
- Remove RealTerm from systems where it is no longer operationally necessary.
Validation and detection
- Inventory installed RealTerm versions across engineering, lab, and operations endpoints.
- Confirm whether version 2.0.0.70 is present on any managed host.
- Review business workflows that depend on RealTerm availability.
- Monitor vendor and project download pages for release or advisory updates.
- If testing is required, perform only controlled non-production validation.
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 lookupCVE-2019-25569 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
- Medium
- CVSS
- 6.9 (4.0)
- Known Exploited
- No
- Published
Vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/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:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N——Primary CVE scoreVulnerability scoring details
Base CVSS 4.0 score
6.9MediumVector: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Source materials
- CVE List V5 sourceCVE List V5
- ExploitDB-46391CVE reference · exploit
- Official Product HomepageCVE reference · product
- Product ReferenceCVE reference · product
- VulnCheck Advisory: RealTerm Serial Terminal 2.0.0.70 SEH Overflow CrashCVE 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.