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CVE-2002-1336

21
FAUCET Score

CVE-2002-1336 describes a vulnerability in TightVNC versions prior to 1.2.6 where the same challenge string is generated for multiple connections. This flaw allows remote attackers to bypass VNC authentication by passively sniffing challenge and response data from other users. With a CVSS score of 7.5, this vulnerability is considered high severity due to its network-based attack vector, low attack complexity, and potential for partial confidentiality, integrity, and availability impacts. There is no evidence of active exploitation, publicly available exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
1.2.0CPE matchmatch criteria
cpe:2.3:a:tightvnc:tightvnc:1.2.0:*:*:*:*:*:*:*
1.2.1CPE matchmatch criteria
cpe:2.3:a:tightvnc:tightvnc:1.2.1:*:*:*:*:*:*:*
1.2.3CPE matchmatch criteria
cpe:2.3:a:tightvnc:tightvnc:1.2.3:*:*:*:*:*:*:*
1.2.4CPE matchmatch criteria
cpe:2.3:a:tightvnc:tightvnc:1.2.4:*:*:*:*:*:*:*
1.2.5CPE matchmatch criteria
cpe:2.3:a:tightvnc:tightvnc:1.2.5:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 2.0

7.5HIGH

AV:N/AC:L/Au:N/C:P/I:P/A:P

Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
Access Vector
NETWORK
Access Complexity
LOW
Authentication
NONE
Exploitability Score
10.0
Impact Score
6.4
CvssVersion
2.0

Exploit Intelligence

EPSS Score
2.40%
Probability of exploitation in next 30 days
EPSS Percentile
82.3%
Percentile rank of EPSS score among Peer Group
As of 2026-07-24
Model: v2026.06.15
This CVE's current EPSS score of 0.0240 is in the 68th percentile among its peer group of 51,455 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 (6)

redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux AS (Advanced Server) version 2.1
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Linux 7.0
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Linux 7.1
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Linux 7.2
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Linux 7.3
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Linux 8.0
View patch

Vendor Advisories (1)

redhatCVE-2002-1336Moderate

security flaw

Jul 26, 2002

References

distro.conectiva.com.br / atualizacoes
marc.info
marc.info
exchange.xforce.ibmcloud.com / vulnerabilities/5992
mandrakesoft.com / security/advisories
redhat.com / support/errata/RHSA-2002-287.html
redhat.com / support/errata/RHSA-2003-041.html
securityfocus.com / bid/5296
tightvnc.com / WhatsNew.txt