CVE-2017-7720: Buffer overflow in PrivateTunnel 2.7 and 2.8 allows local attackers to cause a denial of service (SEH overwrit

Routine

HIGH 7.8DOWNGRADE

CVE-2017-7720 is a high-severity flaw (CVSS 7.8) affecting privatetunnel. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Buffer overflow in PrivateTunnel 2.7 and 2.8 allows local attackers to cause a denial of service (SEH overwrite) or possibly have unspecified other impact via a long password.

Why this priority

High severity

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

Risk facts

CVSS score	7.8 (High)
Attack vector	Local
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.4% (top 68%)
CISA exploited list	No
Weakness	CWE-119
Published	2017-04-26
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: privatetunnel

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

Am I affected?

Timeline

2017-04-26 14:59 UTCPublished CVE record published
2026-06-17 01:25 UTCUpdated Record last modified

privatetunnel privatetunnel DOWNGRADE

Affected: 2.7 · 2.8

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.7

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 2.7 (Debian / Ubuntu)

apt-cache madison privatetunnel sudo apt install privatetunnel=<VERSION_BEFORE_2.7> sudo apt-mark hold privatetunnel

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

dnf --showduplicates list privatetunnel sudo dnf downgrade privatetunnel-<VERSION_BEFORE_2.7> sudo dnf versionlock add privatetunnel

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-2017-7720?

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

Is CVE-2017-7720 being exploited?

CVE-2017-7720 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-2017-7720 affect?

CVE-2017-7720 affects privatetunnel. Severity is high (CVSS 7.8). Buffer overflow in PrivateTunnel 2.7 and 2.8 allows local attackers to cause a denial of service (SEH overwrite) or possibly have unspecified other impact via a long password.

How urgent is CVE-2017-7720?

Priority 35/100. High severity

Related CVEs

CVE-2014-5455 MEDIUM 5.3 DOWNGRADE DOWNGRADE Unquoted Windows search path vulnerability in the ptservice service prior to PrivateTunnel version 3.0 (Window

References

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