CVE-2019-25679: RealTerm Serial Terminal 2.0.0.70 contains a structured exception handling (SEH) buffer overflow vulnerability

Routine

HIGH 7.8DOWNGRADE

CVE-2019-25679 is a high-severity flaw (CVSS 7.8) affecting realterm. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

High severity
Public exploit reference

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	7.8 (High)
Attack vector	Local
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.3% (top 76%)
CISA exploited list	No
Weakness	CWE-787
Published	2026-04-05
Last modified	2026-07-24

Publisher (CNA): VulnCheck · Vendor: crun

Last updated 2026-07-24 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-04-05 21:16 UTCPublished CVE record published
2026-07-24 22:10 UTCUpdated Record last modified

crun realterm DOWNGRADE

Affected: 2.0.0.70

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.0.0.70

1. Check installed version

apt-cache policy realterm || rpm -q realterm || realterm --version

2. No fixed release: DOWNGRADE to a release before 2.0.0.70 (Debian / Ubuntu)

apt-cache madison realterm sudo apt install realterm=<VERSION_BEFORE_2.0.0.70> sudo apt-mark hold realterm

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list realterm sudo dnf downgrade realterm-<VERSION_BEFORE_2.0.0.70> sudo dnf versionlock add realterm

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2019-25679?

realterm: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2019-25679 being exploited?

CVE-2019-25679 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2019-25679 affect?

CVE-2019-25679 affects realterm. Severity is high (CVSS 7.8). 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

How urgent is CVE-2019-25679?

Priority 38/100. High severity; Public exploit reference

References

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