THREATPORT/VULNERABILITY/CVE-2021-30129
MEDIUM SEVERITY

CVE-2021-30129

Sshd vulnerability

CVSS
6.5
EPSS
3.4%
EPSS pct
88th
Exploited
No known
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
Affected vendor
Apache
Affected product
Sshd
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Weakness type (CWE)
  • CWE-772 — Missing Release of Resource after Effective Lifetime
Published
2021-07-12

Risk analysis

Based on its CVSS vector, this vulnerability is exploitable over the network, low attack complexity, requiring low privileges, no user interaction. Successful exploitation leads to high impact to availability.

Its EPSS score of 3.4% reflects a lower probability of exploitation activity in the wild over the next 30 days, placing it above 88% of all scored CVEs.

Check your external exposure to CVE-2021-30129

  • Confirm whether Apache Sshd is running on any internet-facing host or subdomain.
  • Match discovered service fingerprints against the version affected by CVE-2021-30129.
  • Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2021-30129

ThreatPort's external attack surface scanner checks your internet-facing assets — agentlessly, from the outside in — for the exposed services and versions that CVE-2021-30129 affects, then prioritises the finding by real risk using CISA KEV and FIRST.org EPSS.

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