CVE-2010-5248: Untrusted search path vulnerability in UltraVNC 1.0.8.2 allows local users to gain privileges via a Trojan hor

Routine

MEDIUM 6.9DOWNGRADE

CVE-2010-5248 is a medium-severity flaw (CVSS 6.9) affecting ultravnc. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Untrusted search path vulnerability in UltraVNC 1.0.8.2 allows local users to gain privileges via a Trojan horse vnclang.dll file in the current working directory, as demonstrated by a directory that contains a .vnc file. NOTE: some of these details are obtained from third party information.

Why this priority

No elevated risk signals yet

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

Risk facts

CVSS score	6.9 (Medium)
EPSS exploit chance	0.4% (top 66%)
CISA exploited list	No
Published	2012-09-07
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: ultravnc

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

Am I affected?

Timeline

2012-09-07 10:32 UTCPublished CVE record published
2026-06-16 23:26 UTCUpdated Record last modified

ultravnc ultravnc DOWNGRADE

Affected: 1.0.8.2

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.0.8.2

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 1.0.8.2 (Debian / Ubuntu)

apt-cache madison ultravnc sudo apt install ultravnc=<VERSION_BEFORE_1.0.8.2> sudo apt-mark hold ultravnc

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

dnf --showduplicates list ultravnc sudo dnf downgrade ultravnc-<VERSION_BEFORE_1.0.8.2> sudo dnf versionlock add ultravnc

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-2010-5248?

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

Is CVE-2010-5248 being exploited?

CVE-2010-5248 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-2010-5248 affect?

CVE-2010-5248 affects ultravnc. Severity is medium (CVSS 6.9). Untrusted search path vulnerability in UltraVNC 1.0.8.2 allows local users to gain privileges via a Trojan horse vnclang.dll file in the current working directory, as demonstrated by a directory that contains a .vnc file. NOTE: some of the

How urgent is CVE-2010-5248?

Priority 33/100. No elevated risk signals yet.

Related CVEs

CVE-2026-7840 CRITICAL 9.8 UPGRADE UltraVNC repeater through 1.8.2.2 contains a global buffer overflow in its embedded HTTP administration server
CVE-2026-7839 CRITICAL 9.1 UPGRADE UltraVNC repeater through 1.8.2.2 initializes the HTTP administration server with a hardcoded default password
CVE-2026-7838 HIGH 8.8 UPGRADE UltraVNC viewer through 1.8.2.2 contains an integer overflow leading to a heap buffer overflow in the RFB prot
CVE-2026-7828 MEDIUM 5.3 UPGRADE UltraVNC repeater through 1.8.2.2 contains an integer overflow in the HTTP request logging path
CVE-2026-7829 HIGH 7.2 UPGRADE UltraVNC repeater through 1.8.2.2 contains a post-authentication out-of-bounds write in the allow/deny rule pa

References

← Back to latest CVEs