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CVE-2018-20176

24
FAUCET Score

CVE-2018-20176 describes multiple Out-of-Bounds Read vulnerabilities in rdesktop versions up to and including v1.8.3, specifically within the secure.c file. These flaws can be exploited remotely with low attack complexity, leading to a Denial of Service (segfault) for affected rdesktop clients. The vulnerability has a CVSS score of 7.5 (High) due to its potential for complete availability impact. There is no evidence of active exploitation, nor are there publicly available exploits in Metasploit or ExploitDB, and it has received minimal community discussion or media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
<= 1.8.3CPE matchmatch criteria
cpe:2.3:a:rdesktop:rdesktop:*:*:*:*:*:*:*:*

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
3.60%
Probability of exploitation in next 30 days
EPSS Percentile
88.2%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0360 is in the 79th percentile among its peer group of 51,506 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-2018-20176Moderate

rdesktop: Denial of Service in sec_parse_crypt_info and sec_recv

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
research.checkpoint.com / reverse-rdp-attack-code-execution-on-rdp-clients
ExploitThird Party Advisory
security.gentoo.org / glsa/201903-06
debian.org / security/2019/dsa-4394
securityfocus.com / bid/106938