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CVE-2018-20175

26
FAUCET Score

CVE-2018-20175 is a Denial of Service vulnerability affecting rdesktop versions up to and including 1.8.3, caused by integer signedness errors leading to out-of-bounds reads in mcs.c. With a CVSS score of 7.5 (High), it can be exploited remotely with low attack complexity, resulting in a system crash (segfault) without requiring user interaction or privileges. There is currently no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage surrounding this vulnerability.

Impacted Technologies

VendorProductVersion(s)CPE
<= 1.8.3CPE matchmatch criteria
cpe:2.3:a:rdesktop:rdesktop:*:*:*:*:*:*:*:*
8.0CPE matchmatch criteria
cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*
9.0CPE matchmatch criteria
cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*

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
4.30%
Probability of exploitation in next 30 days
EPSS Percentile
90.1%
Percentile rank of EPSS score among Peer Group
As of 2026-07-26
Model: v2026.06.15
This CVE's current EPSS score of 0.0430 is in the 83rd percentile among its peer group of 51,485 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 (3)

github_advisorypatch availablevia nvd_reference
View patch
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 5Fixed in: rdesktop
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 6Fixed in: rdesktop

Vendor Advisories (1)

redhatCVE-2018-20175Moderate

rdesktop: Denial of Service in mcs_recv_connect_response and mcs_parse_domain_params

Jan 4, 2019

References

lists.opensuse.org / opensuse-security-announce/2019-09/msg00040.html
github.com / rdesktop/rdesktop/commit/4dca546d04321a610c1835010b5dad85163b65e1
PatchThird Party Advisory
lists.debian.org / debian-lts-announce/2019/02/msg00030.html
Mailing ListThird Party Advisory
research.checkpoint.com / reverse-rdp-attack-code-execution-on-rdp-clients
ExploitThird Party Advisory
security.gentoo.org / glsa/201903-06
Third Party Advisory
debian.org / security/2019/dsa-4394
Third Party Advisory
securityfocus.com / bid/106938
Third Party AdvisoryVDB Entry