Buffer overflow in Crun Realterm
CVE-2019-25569
RealTerm Serial Terminal 2.0.0.70 contains a stack-based buffer overflow vulnerability in the Echo Port field that allows local attackers to crash the application by triggering a structured exception handler (SEH) chain corruption. Attackers can craft a malicious input string with 268 bytes of padding followed by SEH overwrite values and paste it into the Port field to cause denial of service.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.2 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.002 (8.6th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 9th percentile — 8.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: +0.000
Affected products
- Crun Realterm — versions 2.0.0.70
- Realterm Realterm: Serial Terminal — versions 2.0.0.70
Weakness classification (CWE)
References
- www.exploit-db.com/exploits/46391 (Exploit, VDB Entry, Third Party Advisory, exploit)
- realterm.sourceforge.io/ (Product, product)
- sourceforge.net/projects/realterm/files/ (Product, product)
- www.vulncheck.com/advisories/realterm-serial-terminal-seh-overflow-crash (Third Party Advisory, third-party-advisory)
Frequently asked questions
- What is CVE-2019-25569?
- CVE-2019-25569 is a medium-severity vulnerability in Crun Realterm, classified under Out-of-bounds Write. CVSS score: 6.2/10. Published 2026-03-21.
- How severe is CVE-2019-25569?
- Medium severity. CVSS v3 base score is 6.2 out of 10.