CVE-2025-26466
Scores
EPSS
Percentile: 60.4%
CVSS
CVSS Score: 5.9/10
All CVSS Scores
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Vector Breakdown
CVSS (Common Vulnerability Scoring System) vector provides detailed metrics about vulnerability characteristics
CVSS
Attack Vector
Network (N)
Describes how the vulnerability is exploited
Attack Complexity
High (H)
Describes the conditions beyond the attacker's control
Privileges Required
None (N)
Describes the level of privileges an attacker must possess
User Interaction
None (N)
Captures the requirement for a human user participation
Scope
Unchanged (U)
Determines if a successful attack impacts components beyond the vulnerable component
Confidentiality Impact
None (N)
Measures the impact to the confidentiality of information
Integrity Impact
None (N)
Measures the impact to integrity of a successfully exploited vulnerability
Availability Impact
High (H)
Measures the impact to the availability of the impacted component
Description
A flaw was found in the OpenSSH package. For each ping packet the SSH server receives, a pong packet is allocated in a memory buffer and stored in a queue of packages. It is only freed when the server/client key exchange has finished. A malicious client may keep sending such packages, leading to an uncontrolled increase in memory consumption on the server side. Consequently, the server may become unavailable, resulting in a denial of service attack.
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Sources
CWEs
Related Vulnerabilities
Exploits
Vulnerable Software (19)
Type: Configuration
Operating System:
{ "children": [ { "cpe_match": [ { "cpe23uri": "cpe:2.3:a:openbsd:openssh:*:*:*:*:*:*:*:*", "versionEndExcluding": "9.9p2", "versionStartIncluding": "...
{ "children": [ { "cpe_match": [ { "cpe23uri": "cpe:2.3:a:openbsd:openssh:*:*:*:*:*:*:*:*", "versionEndExcluding": "9.9p2", "versionStartIncluding": "9.5p1" } ], "negate": false, "operator": "OR" } ], "operator": "OR"}
Source: anchore_overrides
Type: Configuration
Product: openssh
Operating System: ubuntu focal 20.04
{ "unaffected": true}
Source: ubuntu
Type: Configuration
Product: openssh
Operating System: ubuntu jammy 22.04
{ "unaffected": true}
Source: ubuntu
Type: Configuration
Product: openssh
Operating System: ubuntu noble 24.04
{ "fixed": "1:9.6p1-3ubuntu13.8"}
Source: ubuntu
Type: Configuration
Product: openssh
Operating System: ubuntu oracular 24.10
{ "fixed": "1:9.7p1-7ubuntu4.2"}
Source: ubuntu
Type: Configuration
Product: openssh
Operating System: ubuntu plucky 25.04
{ "fixed": "9.9p1-3ubuntu3"}
Source: ubuntu
Type: Configuration
Product: openssh
Operating System: debian
{ "fixed": "1:9.9p2-1"}
Source: debian
Type: Configuration
Product: openssh
Operating System: debian bookworm 12
{ "unaffected": true}
Source: debian
Type: Configuration
Product: openssh
Operating System: debian bullseye 11
{ "unaffected": true}
Source: debian
Type: Configuration
Product: openssh
Operating System: astra 1.7.4.7
{ "unaffected": true}
Source: astra
Type: Configuration
Product: openssh
Operating System: astra 4.7.4
{ "unaffected": true}
Source: astra
Type: Configuration
Product: openssh-ssh1
Operating System: ubuntu focal 20.04
{ "unaffected": true}
Source: ubuntu
Type: Configuration
Product: openssh-ssh1
Operating System: ubuntu jammy 22.04
{ "unaffected": true}
Source: ubuntu
Type: Configuration
Product: openssh-ssh1
Operating System: ubuntu noble 24.04
{ "unaffected": true}
Source: ubuntu
Type: Configuration
Product: openssh-ssh1
Operating System: ubuntu oracular 24.10
{ "unaffected": true}
Source: ubuntu
Type: Configuration
Product: openssh-ssh1
Operating System: ubuntu plucky 25.04
{ "unaffected": true}
Source: ubuntu
Type: Configuration
Vendor: *
Product: debian_linux
Operating System: * * *
{ "cpe_match": [ { "cpe23uri": "cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*", "vulnerable": true }, { "cpe23uri": "cpe:2.3:o:debian:debian_linux:12.0:*:*:*:*:*:*:*...
{ "cpe_match": [ { "cpe23uri": "cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*", "vulnerable": true }, { "cpe23uri": "cpe:2.3:o:debian:debian_linux:12.0:*:*:*:*:*:*:*", "vulnerable": true }, { "cpe23uri": "cpe:2.3:o:debian:debian_linux:13.0:*:*:*:*:*:*:*", "vulnerable": true } ], "operator": "OR"}
Source: nvd
Type: Configuration
Vendor: *
Product: openssh
Operating System: * * *
{ "cpe_match": [ { "cpe23uri": "cpe:2.3:a:openbsd:openssh:9.5:p1:*:*:*:*:*:*", "vulnerable": true }, { "cpe23uri": "cpe:2.3:a:openbsd:openssh:9.6:-:*:*:*:*:*:*", ...
{ "cpe_match": [ { "cpe23uri": "cpe:2.3:a:openbsd:openssh:9.5:p1:*:*:*:*:*:*", "vulnerable": true }, { "cpe23uri": "cpe:2.3:a:openbsd:openssh:9.6:-:*:*:*:*:*:*", "vulnerable": true }, { "cpe23uri": "cpe:2.3:a:openbsd:openssh:9.6:p1:*:*:*:*:*:*", "vulnerable": true }, { "cpe23uri": "cpe:2.3:a:openbsd:openssh:9.7:-:*:*:*:*:*:*", "vulnerable": true }, { "cpe23uri": "cpe:2.3:a:openbsd:openssh:9.7:p1:*:*:*:*:*:*", "vulnerable": true }, { "cpe23uri": "cpe:2.3:a:openbsd:openssh:9.8:-:*:*:*:*:*:*", "vulnerable": true }, { "cpe23uri": "cpe:2.3:a:openbsd:openssh:9.8:p1:*:*:*:*:*:*", "vulnerable": true }, { "cpe23uri": "cpe:2.3:a:openbsd:openssh:9.9:-:*:*:*:*:*:*", "vulnerable": true }, { "cpe23uri": "cpe:2.3:a:openbsd:openssh:9.9:p1:*:*:*:*:*:*", "vulnerable": true } ], "operator": "OR"}
Source: nvd
Type: Configuration
Vendor: *
Product: ubuntu_linux
Operating System: * * *
{ "cpe_match": [ { "cpe23uri": "cpe:2.3:o:canonical:ubuntu_linux:24.04:*:*:*:lts:*:*:*", "vulnerable": true }, { "cpe23uri": "cpe:2.3:o:canonical:ubuntu_linux:24.10:*:*...
{ "cpe_match": [ { "cpe23uri": "cpe:2.3:o:canonical:ubuntu_linux:24.04:*:*:*:lts:*:*:*", "vulnerable": true }, { "cpe23uri": "cpe:2.3:o:canonical:ubuntu_linux:24.10:*:*:*:*:*:*:*", "vulnerable": true } ], "operator": "OR"}
Source: nvd