SSH 1.2.27 Authentication race condition

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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9.4$0-$5k0.00

Summaryinfo

A vulnerability marked as critical has been reported in SSH 1.2.27. Impacted is an unknown function of the component Authentication Handler. This manipulation causes race condition. This vulnerability is registered as CVE-1999-0248. No exploit is available. This vulnerability has a historic impact because of its background and how it was received. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability has been found in SSH 1.2.27 (SSH Server Software) and classified as very critical. Affected by this vulnerability is an unknown code of the component Authentication Handler. The manipulation with an unknown input leads to a race condition vulnerability. The CWE definition for the vulnerability is CWE-362. The product contains a code sequence that can run concurrently with other code, and the code sequence requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence that is operating concurrently. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

A race condition in the authentication agent mechanism of sshd 1.2.17 allows an attacker to steal another user's credentials.

The weakness was published 01/01/1999 as not defined advisory (Website). The advisory is shared at oliver.efri.hr. This vulnerability is known as CVE-1999-0248. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Neither technical details nor an exploit are publicly available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 04/17/2026). Due to its background and reception, this vulnerability has a historic impact.

Upgrading eliminates this vulnerability.

The vulnerability is also documented in the databases at X-Force (314) and Vulnerability Center (SBV-705†). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Type

Name

Version

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 9.8
VulDB Meta Temp Score: 9.4

VulDB Base Score: 9.8
VulDB Temp Score: 9.4
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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💳💳💳💳💳💳
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Race condition
CWE: CWE-362
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Timelineinfo

01/01/1999 🔍
01/01/1999 +0 days 🔍
01/01/1999 +0 days 🔍
01/23/2003 +1483 days 🔍
06/19/2014 +4165 days 🔍
04/17/2026 +4320 days 🔍

Sourcesinfo

Advisory: oliver.efri.hr
Status: Confirmed
Confirmation: 🔍

CVE: CVE-1999-0248 (🔍)
GCVE (CVE): GCVE-0-1999-0248
GCVE (VulDB): GCVE-100-14305
X-Force: 314
Vulnerability Center: 705 - Race condition in the authentication agent mechanism of sshd prior to release 1.2.17, Medium

Entryinfo

Created: 06/19/2014 23:18
Updated: 04/17/2026 20:45
Changes: 06/19/2014 23:18 (40), 05/08/2019 10:16 (16), 04/17/2026 20:45 (19)
Complete: 🔍
Cache ID: 216::103

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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