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CVE-2006-1721

12
FAUCET Score

CVE-2006-1721 describes a denial-of-service vulnerability in the CMU Cyrus SASL library, specifically affecting versions 2.1.18 and potentially earlier versions before 2.1.21. Remote, unauthenticated attackers can trigger a segmentation fault by sending malformed inputs during DIGEST-MD5 negotiation. This vulnerability has a low severity score of 2.6, indicating a network-based attack with high access complexity and a partial impact on availability. There is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
2.1.18CPE matchmatch criteria
cpe:2.3:a:cyrus:sasl:2.1.18:*:*:*:*:*:*:*
2.1.18_r1CPE matchmatch criteria
cpe:2.3:a:cyrus:sasl:2.1.18_r1:*:*:*:*:*:*:*
2.1.18_r2CPE matchmatch criteria
cpe:2.3:a:cyrus:sasl:2.1.18_r2:*:*:*:*:*:*:*
2.1.19CPE matchmatch criteria
cpe:2.3:a:cyrus:sasl:2.1.19:*:*:*:*:*:*:*
2.1.20CPE matchmatch criteria
cpe:2.3:a:cyrus:sasl:2.1.20:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 2.0

2.6LOW

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

Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
PARTIAL
Access Vector
NETWORK
Access Complexity
HIGH
Authentication
NONE
Exploitability Score
4.9
Impact Score
2.9
CvssVersion
2.0

Exploit Intelligence

EPSS Score
2.43%
Probability of exploitation in next 30 days
EPSS Percentile
82.5%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0243 is in the 79th percentile among its peer group of 1,506 CVEs.

Social Chatter

No social media mentions found for this CVE.

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

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 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 3Fixed in: cyrus-sasl-0:2.1.15-15
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 4Fixed in: cyrus-sasl-0:2.1.19-14
View patch

Vendor Advisories (1)

redhatCVE-2006-1721Moderate

cyrus-sasl digest-md5 DoS

May 15, 2005

References

patches.sgi.com / support/free/security/advisories/20070901-01-P.asc
asg.web.cmu.edu / archive/message.php
labs.musecurity.com / advisories/MU-200604-01.txt
Patch
lists.apple.com / archives/security-announce/2006/Sep/msg00002.html
lists.grok.org.uk / pipermail/full-disclosure/2006-April/044992.html
secunia.com / advisories/19618
PatchVendor Advisory
secunia.com / advisories/19753
Vendor Advisory
secunia.com / advisories/19809
Vendor Advisory
secunia.com / advisories/19825
Vendor Advisory
secunia.com / advisories/19964
Vendor Advisory
secunia.com / advisories/20014
Vendor Advisory
secunia.com / advisories/22187
Vendor Advisory
secunia.com / advisories/26708
Vendor Advisory
secunia.com / advisories/26857
Vendor Advisory
secunia.com / advisories/27237
Vendor Advisory
secunia.com / advisories/30535
Vendor Advisory
securitytracker.com / id
exchange.xforce.ibmcloud.com / vulnerabilities/25738
oval.cisecurity.org / repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A9861
support.avaya.com / elmodocs2/security/ASA-2007-426.htm
usn.ubuntu.com / 272-1
debian.org / security/2006/dsa-1042
gentoo.org / security/en/glsa/glsa-200604-09.xml
mandriva.com / security/advisories
novell.com / linux/security/advisories/2006_05_05.html
redhat.com / support/errata/RHSA-2007-0795.html
redhat.com / support/errata/RHSA-2007-0878.html
securityfocus.com / archive/1/493080/100/0/threaded
securityfocus.com / bid/17446
Patch
trustix.org / errata/2006/0024
vmware.com / security/advisories/VMSA-2008-0009.html
vupen.com / english/advisories/2006/1306
Vendor Advisory
vupen.com / english/advisories/2006/3852
Vendor Advisory
vupen.com / english/advisories/2008/1744
Vendor Advisory