Heap-based buffer overflow in Sendmail before 8.13.2 allows remote attackers to cause a denial of service (daemon crash) and possibly execute arbitrary code via a long X- header, as demonstrated by an X-Testing header.
Official Statement from Red Hat (05/07/2009)
Based on our analysis this issue does not have a security consequence and does not lead to a buffer overflow or denial of service. For more details of our technical evaluation see
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Advisory; Patch Information