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Servers and applications

CVE-2003-0851

OpenSSL 0.9.6k allows remote attackers to cause a denial of service (crash via large recursion) via malformed ASN.1 sequences.

Severity
Medium 5.0
Published
1 Dec 2003
Last changed
16 Jun 2026
Added to UpHeron
21 Oct 2026
Exploit chance
6.1% in the next 30 daysHigher than 93% of CVEs. EPSS by FIRST, 12 Nov 2026
Attack
Over the network · No login needed
Attacker can
Slow it down
CVSS vector
AV:N/AC:L/Au:N/C:N/I:N/A:P
Sources
NVD

Affected software

SoftwareAffected versions
OpenSSLServers and applications · cpe:a:openssl:openssl
  • Version 0.9.7b
  • Version 0.9.7a
  • Version 0.9.7
  • Version 0.9.6k
All 15 release lines
  • Version 0.9.6
  • Version 0.9.6a
  • Version 0.9.6b
  • Version 0.9.6c
  • Version 0.9.6d
  • Version 0.9.6e
  • Version 0.9.6f
  • Version 0.9.6g
  • Version 0.9.6h
  • Version 0.9.6i
  • Version 0.9.6j
  • Version 0.9.6k
  • Version 0.9.7
  • Version 0.9.7a
  • Version 0.9.7b

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2003-0851
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2003-0851