UpHeron
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Servers and applications

CVE-2001-1382

The "echo simulation" traffic analysis countermeasure in OpenSSH before 2.9.9p2 sends an additional echo packet after the password and carriage return is entered, which could allow remote attackers to determine that the countermeasure is being used.

Severity
Medium 5.0
Published
27 Sept 2001
Last changed
16 Jun 2026
Added to UpHeron
21 Oct 2026
Exploit chance
7.6% in the next 30 daysHigher than 94% of CVEs. EPSS by FIRST, 12 Nov 2026
Attack
Over the network · No login needed
Attacker can
Read some data
CVSS vector
AV:N/AC:L/Au:N/C:P/I:N/A:N
Sources
NVD

Affected software

SoftwareAffected versions
OpenSSHServers and applications · cpe:a:openbsd:openssh
  • Every version up to 2.9.9p2

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2001-1382
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2001-1382