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CVE-2010-5107· NVD / CVE Program· CNA redhat

The default configuration of OpenSSH through 6.1 enforces a fixed time limit between establishing a TCP connection and completing a login, w

The default configuration of OpenSSH through 6.1 enforces a fixed time limit between establishing a TCP connection and completing a login, which makes it easier for remote attackers to cause a denial of service (connection-slot exhaustion) by periodically making many new TCP connections.

HighCVSS 7.5 · v3.1—No exploit Fix available
Published
Mar 7, 2013
Updated
Jun 16, 2026
EPSS
16.5% · 97th percentile
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Report tools

JSON

Action score

35

Monitor

Low priority for now.

CVSS
30 / 40 · 7.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
5 / 30 · 16.5%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

Noroxi analysis

No Noroxi analysis for this record yet

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Affected systems

VendorProduct
openbsdopenssh

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • openbsd opensshup to 6.1 inclusive
  • openbsd openssh1.2
  • openbsd openssh1.2.1
  • openbsd openssh1.2.2
  • openbsd openssh1.2.27
  • openbsd openssh1.2.3
  • openbsd openssh1.3
  • openbsd openssh1.5
  • openbsd openssh1.5.7
  • openbsd openssh1.5.8
  • openbsd openssh2.1
  • openbsd openssh2.1.1
  • openbsd openssh2.2
  • openbsd openssh2.3
  • openbsd openssh2.3.1
  • openbsd openssh2.5
  • openbsd openssh2.5.1
  • openbsd openssh2.5.2
  • openbsd openssh2.9
  • openbsd openssh2.9.9

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12opensshbefore 1:6.0p1-41:6.0p1-4
Red Hat:enterprise_linux:6::clientopensshbefore 0:5.3p1-94.el60:5.3p1-94.el6
Red Hat:enterprise_linux:6::clientopenssh-askpassbefore 0:5.3p1-94.el60:5.3p1-94.el6
Red Hat:enterprise_linux:6::clientopenssh-clientsbefore 0:5.3p1-94.el60:5.3p1-94.el6
Red Hat:enterprise_linux:6::clientopenssh-debuginfobefore 0:5.3p1-94.el60:5.3p1-94.el6
Red Hat:enterprise_linux:6::clientopenssh-ldapbefore 0:5.3p1-94.el60:5.3p1-94.el6
Red Hat:enterprise_linux:6::clientopenssh-serverbefore 0:5.3p1-94.el60:5.3p1-94.el6
Red Hat:enterprise_linux:6::clientpam_ssh_agent_authbefore 0:0.9.3-94.el60:0.9.3-94.el6
Red Hat:enterprise_linux:6::hypervisorrhev-hypervisor6before 0:6.5-20131115.0.3.2.el6_50:6.5-20131115.0.3.2.el6_5

Same product

openbsd: all records

Other highest-scoring records for the same primary product.

  • CVE-2023-38408The PKCS#11 feature in ssh-agent in OpenSSH before 9.3p2 has an insufficiently trustworthy search path, leading to remote code execution if
    63This week
  • CVE-2023-25136OpenSSH server (sshd) 9.1 introduced a double-free vulnerability during options.kex_algorithms handling.
    53Plan
  • CVE-2018-15473OpenSSH through 7.7 is prone to a user enumeration vulnerability due to not delaying bailout for an invalid authenticating user until after
    51Plan
  • CVE-2016-6210sshd in OpenSSH before 7.3, when SHA256 or SHA512 are used for user password hashing, uses BLOWFISH hashing on a static password when the us
    50Plan
  • CVE-2016-6515The auth_password function in auth-passwd.c in sshd in OpenSSH before 7.3 does not limit password lengths for password authentication, which
    48Plan
  • CVE-2002-0640Buffer overflow in sshd in OpenSSH 2.3.1 through 3.3 may allow remote attackers to execute arbitrary code via a large number of responses du
    48Plan

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
debian:openssh1:6.0p1-4 · Debian:12Package registry (OSV)
red hat:openssh0:5.3p1-94.el6 · Red Hat:enterprise_linux:6::clientPackage registry (OSV)
red hat:openssh-askpass0:5.3p1-94.el6 · Red Hat:enterprise_linux:6::clientPackage registry (OSV)
red hat:openssh-clients0:5.3p1-94.el6 · Red Hat:enterprise_linux:6::clientPackage registry (OSV)
red hat:openssh-debuginfo0:5.3p1-94.el6 · Red Hat:enterprise_linux:6::clientPackage registry (OSV)
red hat:openssh-ldap0:5.3p1-94.el6 · Red Hat:enterprise_linux:6::clientPackage registry (OSV)
red hat:openssh-server0:5.3p1-94.el6 · Red Hat:enterprise_linux:6::clientPackage registry (OSV)
red hat:pam_ssh_agent_auth0:0.9.3-94.el6 · Red Hat:enterprise_linux:6::clientPackage registry (OSV)
red hat:rhev-hypervisor60:6.5-20131115.0.3.2.el6_5 · Red Hat:enterprise_linux:6::hypervisorPackage registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
none
Integrity
none
Availability
high · the service can be disrupted
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
None
Availability impact
High

Weakness class (CWE)

CWE-400 · Uncontrolled Resource Consumption

CVSS vector

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

nvd-secondary

Root cause

Code that parses nested structures sets no depth or size limit. A small input can turn into a disproportionate processing load.

The bug in code

The whole CWE-400 class

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

Vulnerable

ts
function expand(node) {  return node.children.map(expand);}

Fixed

ts
const MAX_DEPTH = 32;function expand(node, depth = 0) {  if (depth > MAX_DEPTH) throw new Error("too deep");  return node.children.map((c) => expand(c, depth + 1));}

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records