CVE-2010-1039: Format string vulnerability in the _msgout function in rpc.pcnfsd in IBM AIX 6.1, 5.3, and earlier; IBM VIOS 2

Q: How do I fix CVE-2010-1039?

nfs\/oncplus: upgrade to newer than b.11.31_09; aix: upgrade to newer than 5.3; vios: upgrade to newer than 1.5. Exact commands for each OS are on this page.

Q: Is CVE-2010-1039 being exploited?

CVE-2010-1039 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-2010-1039 affect?

CVE-2010-1039 affects nfs\/oncplus, aix, vios. Severity is high (CVSS 10.0). Format string vulnerability in the _msgout function in rpc.pcnfsd in IBM AIX 6.1, 5.3, and earlier; IBM VIOS 2.1, 1.5, and earlier; NFS/ONCplus B.11.31_09 and earlier on HP HP-UX B.11.11, B.11.23, and B.11.31; and SGI IRIX 6.5 allows remote

Q: How urgent is CVE-2010-1039?

Priority 64/100. Critical severity; EPSS top 3%: very likely to be exploited; Public exploit reference

This week

HIGH 10.0UPGRADEUPGRADEUPGRADE

CVE-2010-1039 is a high-severity flaw (CVSS 10.0) affecting nfs\/oncplus, aix, vios. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Format string vulnerability in the _msgout function in rpc.pcnfsd in IBM AIX 6.1, 5.3, and earlier; IBM VIOS 2.1, 1.5, and earlier; NFS/ONCplus B.11.31_09 and earlier on HP HP-UX B.11.11, B.11.23, and B.11.31; and SGI IRIX 6.5 allows remote attackers to execute arbitrary code via an RPC request containing format string specifiers in an invalid directory name.

Why this priority

Critical severity
EPSS top 3%: very likely to be exploited
Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	10.0 (High)
EPSS exploit chance	18.8% (top 3%)
CISA exploited list	No
Weakness	CWE-134
Published	2010-05-20
Last modified	2026-06-16

Publisher (CNA): HP Inc. · Vendor: hp · ibm · sgi

Last updated 2026-06-16 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2010-05-20 17:30 UTCPublished CVE record published
2026-06-16 23:17 UTCUpdated Record last modified

hp nfs\/oncplus UPGRADE

Affected: <= b.11.31_09

Fixed in: newer than b.11.31_09

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to newer than b.11.31_09 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade nfsoncplus

Note

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

ibm aix UPGRADE

Affected: <= 5.3 · 1.2.1 · 1.3 · 2.2.1 · 3.1 · 3.2 · 3.2.0 · 3.2.4

Fixed in: newer than 5.3

Safe to downgrade to: no unaffected older release

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

ibm vios UPGRADE

Affected: <= 1.5 · 1.4 · 2.1

Fixed in: newer than 1.5

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to newer than 1.5 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade vios

Note

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

sgi irix MITIGATE

Affected: 6.5

Fixed in: no fixed release known

Safe to downgrade to: a release before 6.5

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Exploit-DB: rpc.pcnfsd - Remote Format String

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-2010-1039?

nfs\/oncplus: upgrade to newer than b.11.31_09; aix: upgrade to newer than 5.3; vios: upgrade to newer than 1.5. Exact commands for each OS are on this page.

Is CVE-2010-1039 being exploited?

CVE-2010-1039 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-2010-1039 affect?

CVE-2010-1039 affects nfs\/oncplus, aix, vios. Severity is high (CVSS 10.0). Format string vulnerability in the _msgout function in rpc.pcnfsd in IBM AIX 6.1, 5.3, and earlier; IBM VIOS 2.1, 1.5, and earlier; NFS/ONCplus B.11.31_09 and earlier on HP HP-UX B.11.11, B.11.23, and B.11.31; and SGI IRIX 6.5 allows remote

How urgent is CVE-2010-1039?

Priority 64/100. Critical severity; EPSS top 3%: very likely to be exploited; Public exploit reference

Related CVEs

CVE-2011-0896 MEDIUM 6.8 UPGRADE MITIGATE Unspecified vulnerability in HP NFS/ONCplus B.11.31.10 and earlier on HP-UX B.11.31 allows remote authenticate

References

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