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CVE-2017-7394

25
FAUCET Score

CVE-2017-7394 is a denial-of-service vulnerability affecting TigerVNC 1.7.1, specifically within the SSecurityPlain::processMsg function. Unauthenticated attackers can crash the server by sending excessively long usernames. This vulnerability has a CVSS score of 7.5 (HIGH), indicating it can be exploited remotely with low attack complexity, leading to high availability impact without requiring user interaction or privileges. There is no evidence of active exploitation, public exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
1.7.1CPE matchmatch criteria
cpe:2.3:a:tigervnc:tigervnc:1.7.1:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

7.5HIGH

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
3.6
CvssVersion
3.0

Exploit Intelligence

EPSS Score
1.61%
Probability of exploitation in next 30 days
EPSS Percentile
73.4%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0161 is in the 56th percentile among its peer group of 51,551 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (4)

github_advisorypatch availablevia nvd_reference
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: fltk-0:1.3.4-1.el7
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: tigervnc-0:1.8.0-1.el7
View patch
redhatno patchvia redhat_api
Product: Red Hat Enterprise Linux 6Fixed in: tigervnc

Vendor Advisories (1)

redhatCVE-2017-7394Moderate

tigervnc: Server crash via long usernames

Mar 29, 2017

References

access.redhat.com / errata/RHSA-2017:2000
github.com / TigerVNC/tigervnc/pull/440
Issue TrackingPatchThird Party Advisory
security.gentoo.org / glsa/201801-13
securityfocus.com / bid/97305