Buffer overflow in Crun Realterm
CVE-2019-25679
RealTerm Serial Terminal 2.0.0.70 contains a structured exception handling (SEH) buffer overflow vulnerability in the Echo Port tab that allows local attackers to execute arbitrary code by supplying a malicious payload. Attackers can craft a buffer overflow payload with a POP POP RET gadget chain and shellcode that triggers code execution when pasted into the Port field and the Change button is clicked.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.003 (23.1th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 23rd percentile — 23.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000
Affected products
- Crun Realterm — versions 2.0.0.70
- Realterm Realterm: Serial Terminal — versions 1.11.2
Weakness classification (CWE)
References
- www.exploit-db.com/exploits/46441 (Exploit, VDB Entry, exploit)
- realterm.sourceforge.io/ (Product, product)
- sourceforge.net/projects/realterm/files/ (Product, product)
- www.vulncheck.com/advisories/realterm-serial-terminal-buffer-overflow-seh (Third Party Advisory, third-party-advisory)
Frequently asked questions
- What is CVE-2019-25679?
- CVE-2019-25679 is a high-severity vulnerability in Crun Realterm, classified under Out-of-bounds Write. CVSS score: 7.8/10. Published 2026-04-05.
- How severe is CVE-2019-25679?
- High severity. CVSS v3 base score is 7.8 out of 10.