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CVE-2018-15361

32
FAUCET Score

CVE-2018-15361 describes a critical buffer underflow vulnerability in UltraVNC revision 1198's VNC client code, potentially leading to remote code execution. This flaw is highly severe with a CVSS score of 9.8 (CRITICAL), indicating it is network-exploitable without user interaction, allowing for complete compromise of confidentiality, integrity, and availability. While no public exploits or active exploitation have been identified, the vulnerability has garnered some community discussion and media coverage, highlighting its potential impact. The issue has been addressed in UltraVNC revision 1199.

Impacted Technologies

VendorProductVersion(s)CPE
< 1.2.2.3CPE matchmatch criteria
cpe:2.3:a:uvnc:ultravnc:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

9.8CRITICAL

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
5.9
CvssVersion
3.0

Exploit Intelligence

EPSS Score
2.88%
Probability of exploitation in next 30 days
EPSS Percentile
85.4%
Percentile rank of EPSS score among Peer Group
As of 2026-07-25
Model: v2026.06.15
This CVE's current EPSS score of 0.0288 is in the 76th percentile among its peer group of 36,833 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

cert-portal.siemens.com / productcert/pdf/ssa-927095.pdf
ics-cert.kaspersky.com / advisories/klcert-advisories/2019/03/01/klcert-19-003-ultravnc-buffer-underwrite
Third Party Advisory
us-cert.gov / ics/advisories/icsa-20-161-06