CVE-2019-25627: FlexHEX 2.71 contains a local buffer overflow vulnerability in the Stream Name field that allows local attacke

Routine

HIGH 8.4DOWNGRADE

CVE-2019-25627 is a high-severity flaw (CVSS 8.4) affecting flexhex. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

FlexHEX 2.71 contains a local buffer overflow vulnerability in the Stream Name field that allows local attackers to execute arbitrary code by triggering a structured exception handler (SEH) overflow. Attackers can craft a malicious text file with carefully aligned shellcode and SEH chain pointers, paste the contents into the Stream Name dialog, and execute arbitrary commands like calc.exe when the exception handler is triggered.

Why this priority

High severity
Public exploit reference

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

Risk facts

CVSS score	8.4 (High)
Attack vector	Local
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.3% (top 81%)
CISA exploited list	No
Weakness	CWE-434
Published	2026-03-24
Last modified	2026-06-17

Publisher (CNA): VulnCheck · Vendor: flexhex

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-03-24 12:16 UTCPublished CVE record published
2026-06-17 02:32 UTCUpdated Record last modified

flexhex flexhex DOWNGRADE

Affected: 2.71

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.71

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 2.71 (Debian / Ubuntu)

apt-cache madison flexhex sudo apt install flexhex=<VERSION_BEFORE_2.71> sudo apt-mark hold flexhex

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

dnf --showduplicates list flexhex sudo dnf downgrade flexhex-<VERSION_BEFORE_2.71> sudo dnf versionlock add flexhex

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-2019-25627?

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

Is CVE-2019-25627 being exploited?

CVE-2019-25627 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-2019-25627 affect?

CVE-2019-25627 affects flexhex. Severity is high (CVSS 8.4). FlexHEX 2.71 contains a local buffer overflow vulnerability in the Stream Name field that allows local attackers to execute arbitrary code by triggering a structured exception handler (SEH) overflow. Attackers can craft a malicious text fil

How urgent is CVE-2019-25627?

Priority 39/100. High severity; Public exploit reference

References

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