CVE-2018-10238: bvlc.c in skarg BACnet Protocol Stack bacserv 0.9.1 and 0.8.5 is affected by a Buffer Overflow because of a la

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CRITICAL 9.8REMOTEDOWNGRADE

CVE-2018-10238 is a critical-severity flaw (CVSS 9.8) affecting bacnet protocol stack. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

bvlc.c in skarg BACnet Protocol Stack bacserv 0.9.1 and 0.8.5 is affected by a Buffer Overflow because of a lack of packet-size validation. The affected component is bacserv BACnet/IP BVLC forwarded NPDU. The function bvlc_bdt_forward_npdu() calls bvlc_encode_forwarded_npdu() which copies the content from the request into a local in the bvlc_bdt_forward_npdu() stack frame and clobbers the canary. The attack vector is: A BACnet/IP device with BBMD

Why this priority

Critical severity
Remotely exploitable, no login, no user action

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

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.6% (top 24%)
CISA exploited list	No
Weakness	CWE-119
Published	2018-04-20
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: bacnet protocol stack project

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

Am I affected?

Timeline

2018-04-20 07:29 UTCPublished CVE record published
2026-06-17 01:33 UTCUpdated Record last modified

bacnet protocol stack project bacnet protocol stack DOWNGRADE

Affected: 0.8.5

Fixed in: no fixed release known

Safe to downgrade to: a release before 0.8.5

1. Check installed version

apt-cache policy bacnet-protocol-stack || rpm -q bacnet-protocol-stack || bacnet-protocol-stack --version

2. No fixed release: DOWNGRADE to a release before 0.8.5 (Debian / Ubuntu)

apt-cache madison bacnet-protocol-stack sudo apt install bacnet-protocol-stack=<VERSION_BEFORE_0.8.5> sudo apt-mark hold bacnet-protocol-stack

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

dnf --showduplicates list bacnet-protocol-stack sudo dnf downgrade bacnet-protocol-stack-<VERSION_BEFORE_0.8.5> sudo dnf versionlock add bacnet-protocol-stack

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-2018-10238?

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

Is CVE-2018-10238 being exploited?

CVE-2018-10238 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-2018-10238 affect?

CVE-2018-10238 affects bacnet protocol stack. Severity is critical (CVSS 9.8). bvlc.c in skarg BACnet Protocol Stack bacserv 0.9.1 and 0.8.5 is affected by a Buffer Overflow because of a lack of packet-size validation. The affected component is bacserv BACnet/IP BVLC forwarded NPDU. The function bvlc_bdt_forward_npdu(

How urgent is CVE-2018-10238?

Priority 58/100. Critical severity; Remotely exploitable, no login, no user action

Related CVEs

CVE-2019-12480 HIGH 7.5 UPGRADE BACnet Protocol Stack through 0.8.6 has a segmentation fault leading to denial of service in BACnet APDU Layer

References

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