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Vulnerability record · CVE-2021-30129 · published 12 July 2021

CVE-2021-30129: Apache sshd vulnerability

Apache · Sshd

A vulnerability in sshd-core of Apache Mina SSHD allows an attacker to overflow the server causing an OutOfMemory error. This issue affects the SFTP and port forwarding features of Apache Mina SSHD version 2.0.0 and later versions. It was addressed in Apache Mina SSHD 2.7.0

6.5 CVSS 3.1 Medium EPSS 3.0% · top 13.0% CWE-772 · CWE-772
6.5CVSS 3.1 base score, v2 4.0
3.0%EPSS exploitation probability, 30 days
NoNot in CISA KEV
9Affected product versions listed by NVD
16References
17 Jun 2026Last modified by NVD

Description

A vulnerability in sshd-core of Apache Mina SSHD allows an attacker to overflow the server causing an OutOfMemory error. This issue affects the SFTP and port forwarding features of Apache Mina SSHD version 2.0.0 and later versions. It was addressed in Apache Mina SSHD 2.7.0

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected products

9 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://www.openwall.com/lists/oss-security/2021/07/12/1 Mailing ListThird Party Advisory
https://lists.apache.org/thread.html/r6d4f78e192a0c8eabd671a018da464024642980ecd24096bde6db36f%40%3Cusers.mina.apache.or Mailing ListVendor Advisory
https://lists.apache.org/thread.html/r6d4f78e192a0c8eabd671a018da464024642980ecd24096bde6db36f%40%3Cusers.mina.apache.or Mailing ListVendor Advisory
https://lists.apache.org/thread.html/r6d4f78e192a0c8eabd671a018da464024642980ecd24096bde6db36f%40%3Cusers.mina.apache.or Mailing ListVendor Advisory
https://lists.apache.org/thread.html/r6d4f78e192a0c8eabd671a018da464024642980ecd24096bde6db36f%40%3Cusers.mina.apache.or Mailing ListVendor Advisory
https://lists.apache.org/thread.html/red01829efa2a8c893c4baff4f23c9312bd938543a9b8658e172b853b%40%3Cannounce.apache.org%
https://www.oracle.com/security-alerts/cpuapr2022.html PatchThird Party Advisory
https://www.oracle.com/security-alerts/cpujul2022.html
http://www.openwall.com/lists/oss-security/2021/07/12/1 Mailing ListThird Party Advisory
https://lists.apache.org/thread.html/r6d4f78e192a0c8eabd671a018da464024642980ecd24096bde6db36f%40%3Cusers.mina.apache.or Mailing ListVendor Advisory
https://lists.apache.org/thread.html/r6d4f78e192a0c8eabd671a018da464024642980ecd24096bde6db36f%40%3Cusers.mina.apache.or Mailing ListVendor Advisory
https://lists.apache.org/thread.html/r6d4f78e192a0c8eabd671a018da464024642980ecd24096bde6db36f%40%3Cusers.mina.apache.or Mailing ListVendor Advisory
https://lists.apache.org/thread.html/r6d4f78e192a0c8eabd671a018da464024642980ecd24096bde6db36f%40%3Cusers.mina.apache.or Mailing ListVendor Advisory
https://lists.apache.org/thread.html/red01829efa2a8c893c4baff4f23c9312bd938543a9b8658e172b853b%40%3Cannounce.apache.org%
https://www.oracle.com/security-alerts/cpuapr2022.html PatchThird Party Advisory
https://www.oracle.com/security-alerts/cpujul2022.html

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Source: NIST National Vulnerability Database (record CVE-2021-30129), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.