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CVE-2018-15127

38
FAUCET Score

CVE-2018-15127 is a critical heap out-of-bounds write vulnerability in LibVNC's server-side file transfer extension, affecting products from Canonical, Debian, and Red Hat. With a CVSS score of 9.8, this vulnerability allows unauthenticated remote attackers to achieve remote code execution with low attack complexity. While no public exploit code or active exploitation has been observed, the vulnerability has garnered significant community discussion and media coverage, indicating its potential impact.

Impacted Technologies

VendorProductVersion(s)CPE
< 0.9.12CPE matchmatch criteria
cpe:2.3:a:libvnc_project:libvncserver:*:*:*:*:*:*:*:*
14.04CPE matchmatch criteria
cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:lts:*:*:*
16.04CPE matchmatch criteria
cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:*
18.04CPE matchmatch criteria
cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:*
18.10CPE matchmatch criteria
cpe:2.3:o:canonical:ubuntu_linux:18.10:*:*:*:*:*:*:*

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
15.09%
Probability of exploitation in next 30 days
EPSS Percentile
96.4%
Percentile rank of EPSS score among Peer Group
As of 2026-07-25
Model: v2026.06.15
This CVE's current EPSS score of 0.1509 is in the 92nd 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

Patch Available

Vendor Patches (2)

redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: libvncserver-0:0.9.9-13.el7_6
View patch
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 6Fixed in: libvncserver

Vendor Advisories (1)

redhatCVE-2018-15127Important

libvncserver: Heap out-of-bounds write in rfbserver.c in rfbProcessFileTransferReadBuffer() allows for potential code execution

Dec 19, 2018

References

access.redhat.com / errata/RHSA-2019:0059
Third Party Advisory
ics-cert.kaspersky.com / advisories/klcert-advisories/2018/12/19/klcert-18-028-libvnc-heap-out-of-bound-write
Third Party Advisory
lists.debian.org / debian-lts-announce/2018/12/msg00017.html
Mailing ListThird Party Advisory
lists.debian.org / debian-lts-announce/2019/10/msg00042.html
usn.ubuntu.com / 3877-1
Third Party Advisory
usn.ubuntu.com / 4547-1
usn.ubuntu.com / 4587-1
debian.org / security/2019/dsa-4383
Third Party Advisory