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Fencer Vulns
low 2.6

CVE-2006-1721 json

digestmd5.c in the CMU Cyrus Simple Authentication and Security Layer (SASL) library 2.1.18, and possibly other versions before 2.1.21, all…

published 2006-04-11 20 y ago modified 2026-06-16 4 mo ago also EUVD-2006-1721

cvss
2.6
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
2.5%
EPSS 2.5% chance of exploitation in 30 days, percentile 84%
public exploits
0
none known

Summary

digestmd5.c in the CMU Cyrus Simple Authentication and Security Layer (SASL) library 2.1.18, and possibly other versions before 2.1.21, allows remote unauthenticated attackers to cause a denial of service (segmentation fault) via malformed inputs in DIGEST-MD5 negotiation.

Patch / fix

  • cyrus-sasl2 Debian 14, Debian 13, Debian 12 2.1.19.dfsg1-0.2

debian advisories DEBIAN-CVE-2006-1721

  • cyrus-sasl RHEL 3 2.1.15-15
  • cyrus-sasl-md5 RHEL 3 2.1.15-15
  • cyrus-sasl-plain RHEL 3 2.1.15-15
  • cyrus-sasl-gssapi RHEL 3 2.1.15-15
  • cyrus-sasl RHEL 4 2.1.19-14
  • cyrus-sasl-md5 RHEL 4 2.1.19-14
  • cyrus-sasl-sql RHEL 4 2.1.19-14
  • cyrus-sasl-ntlm RHEL 4 2.1.19-14

red hat advisories RHSA-2007:0878RHSA-2007:0795

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2006-1721 updated

cyrus-sasl digest-md5 DoS

  • Red Hat Desktop version 3 cyrus-sasl 2.1.15-15, cyrus-sasl-md5 2.1.15-15, cyrus-sasl-plain 2.1.15-15, cyrus-sasl-gssapi 2.1.15-15 Red Hat Enterprise Linux AS version 3 cyrus-sasl 2.1.15-15, cyrus-sasl-md5 2.1.15-15, cyrus-sasl-plain 2.1.15-15, cyrus-sasl-gssapi 2.1.15-15
    fixed: vendor fix RHSA-2007:0878
  • Red Hat Enterprise Linux AS version 4 cyrus-sasl 2.1.19-14, cyrus-sasl-md5 2.1.19-14, cyrus-sasl-sql 2.1.19-14, cyrus-sasl-ntlm 2.1.19-14, cyrus-sasl-plain 2.1.19-14, cyrus-sasl-gssapi 2.1.19-14 Red Hat Enterprise Linux Desktop version 4 cyrus-sasl 2.1.19-14, cyrus-sasl-md5 2.1.19-14, cyrus-sasl-sql 2.1.19-14, cyrus-sasl-ntlm 2.1.19-14, cyrus-sasl-plain 2.1.19-14, cyrus-sasl-gssapi 2.1.19-14
    fixed: vendor fix RHSA-2007:0795
  • Red Hat Enterprise Linux ES version 3 cyrus-sasl 2.1.15-15, cyrus-sasl-md5 2.1.15-15, cyrus-sasl-plain 2.1.15-15, cyrus-sasl-gssapi 2.1.15-15
    fixed: vendor fix RHSA-2007:0878
  • Red Hat Enterprise Linux ES version 4 cyrus-sasl 2.1.19-14, cyrus-sasl-md5 2.1.19-14, cyrus-sasl-sql 2.1.19-14, cyrus-sasl-ntlm 2.1.19-14, cyrus-sasl-plain 2.1.19-14, cyrus-sasl-gssapi 2.1.19-14
    fixed: vendor fix RHSA-2007:0795
  • Red Hat Enterprise Linux WS version 3 cyrus-sasl 2.1.15-15, cyrus-sasl-md5 2.1.15-15, cyrus-sasl-plain 2.1.15-15, cyrus-sasl-gssapi 2.1.15-15
    fixed: vendor fix RHSA-2007:0878
  • Red Hat Enterprise Linux WS version 4 cyrus-sasl 2.1.19-14, cyrus-sasl-md5 2.1.19-14, cyrus-sasl-sql 2.1.19-14, cyrus-sasl-ntlm 2.1.19-14, cyrus-sasl-plain 2.1.19-14, cyrus-sasl-gssapi 2.1.19-14
    fixed: vendor fix RHSA-2007:0795

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

2.49% chance of exploitation in the next 30 days, higher than 84% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 2.0 2.6 AV:N/AC:H/Au:N/C:N/I:N/A:P

Classification

Weakness
  • CWE-20 Improper Input Validation

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.