CVE-2025-63927: A heap-use-after-free vulnerability exists in airpig2011 IEC104 thru Commit be6d841 (2019-07-08)

Q: How do I fix CVE-2025-63927?

iec104: upgrade to newer than 2019-07-08. Exact commands for each OS are on this page.

Q: Is CVE-2025-63927 being exploited?

CVE-2025-63927 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2025-63927 affect?

CVE-2025-63927 affects iec104. Severity is medium (CVSS 4.0). A heap-use-after-free vulnerability exists in airpig2011 IEC104 thru Commit be6d841 (2019-07-08). During multi-threaded client execution, the function Iec10x_Scheduled can access memory that has already been freed, potentially causing progr

Q: How urgent is CVE-2025-63927?

Priority 22/100. Public exploit reference

Routine

MEDIUM 4.0UPGRADE

CVE-2025-63927 is a medium-severity flaw (CVSS 4.0) affecting iec104. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A heap-use-after-free vulnerability exists in airpig2011 IEC104 thru Commit be6d841 (2019-07-08). During multi-threaded client execution, the function Iec10x_Scheduled can access memory that has already been freed, potentially causing program crashes or undefined behavior. This may be exploited to trigger a denial-of-service or memory corruption.

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	4.0 (Medium)
Attack vector	Local
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.2% (top 89%)
CISA exploited list	No
Weakness	CWE-122
Published	2025-11-12
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: airpig2011

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

Am I affected?

Timeline

2025-11-12 19:15 UTCPublished CVE record published
2026-06-17 09:53 UTCUpdated Record last modified

airpig2011 iec104 UPGRADE

Affected: <= 2019-07-08

Fixed in: newer than 2019-07-08

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy iec104 || rpm -q iec104 || iec104 --version

2. UPGRADE to newer than 2019-07-08 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade iec104

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade iec104

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

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-2025-63927?

iec104: upgrade to newer than 2019-07-08. Exact commands for each OS are on this page.

Is CVE-2025-63927 being exploited?

CVE-2025-63927 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-2025-63927 affect?

CVE-2025-63927 affects iec104. Severity is medium (CVSS 4.0). A heap-use-after-free vulnerability exists in airpig2011 IEC104 thru Commit be6d841 (2019-07-08). During multi-threaded client execution, the function Iec10x_Scheduled can access memory that has already been freed, potentially causing progr

How urgent is CVE-2025-63927?

Priority 22/100. Public exploit reference

Related CVEs

CVE-2025-63929 HIGH 7.5 UPGRADE A null pointer dereference vulnerability exists in airpig2011 IEC104 thru Commit be6d841 (2019-07-08)

References

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