← Vulnerability feed

Vulnerability record · CVE-2020-12692 · published 7 May 2020

CVE-2020-12692: Openstack keystone authentication bypass by capture-replay vulnerability

Openstack · Keystone

An issue was discovered in OpenStack Keystone before 15.0.1, and 16.0.0. The EC2 API doesn't have a signature TTL check for AWS Signature V4. An attacker can sniff the Authorization header, and then use it to reissue an OpenStack token an unlimited number of times.

5.4 CVSS 3.1 Medium EPSS 0.71% · top 48.6% CWE-294 · Authentication bypass by capture-replayCWE-347 · Improper verification of cryptographic signature
5.4CVSS 3.1 base score, v2 5.5
0.71%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
10References
17 Jun 2026Last modified by NVD

Description

An issue was discovered in OpenStack Keystone before 15.0.1, and 16.0.0. The EC2 API doesn't have a signature TTL check for AWS Signature V4. An attacker can sniff the Authorization header, and then use it to reissue an OpenStack token an unlimited number of times.

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

Affected products

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

References

LinkTags
http://www.openwall.com/lists/oss-security/2020/05/07/1 Mailing ListThird Party Advisory
https://bugs.launchpad.net/keystone/+bug/1872737 Third Party Advisory
https://security.openstack.org/ossa/OSSA-2020-003.html Vendor Advisory
https://usn.ubuntu.com/4480-1/ Third Party Advisory
https://www.openwall.com/lists/oss-security/2020/05/06/4 Mailing ListThird Party Advisory
http://www.openwall.com/lists/oss-security/2020/05/07/1 Mailing ListThird Party Advisory
https://bugs.launchpad.net/keystone/+bug/1872737 Third Party Advisory
https://security.openstack.org/ossa/OSSA-2020-003.html Vendor Advisory
https://usn.ubuntu.com/4480-1/ Third Party Advisory
https://www.openwall.com/lists/oss-security/2020/05/06/4 Mailing ListThird Party Advisory

Track CVE-2020-12692 inside VULONE

Watch it alongside the ransomware crews, C2 infrastructure and forum chatter that reference it, query it through the API and pull it into your SIEM over TAXII.

Start free Open in platform

Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2020-11651SaltStack Salt master authentication bypass in ClearFuncsSaltStack Salt before 2019.2.4 and 3000 before 3000.2 fails to properly validate method calls in the salt-master ClearFuncs class, allowing remote un…KEVEPSS 97%analysed9.8CVE-2020-7247OpenSMTPD MAIL FROM command injection allows remote root code executionOpenSMTPD 6.6, as shipped in OpenBSD 6.6 and other products, mishandles input validation in smtp_mailaddr in smtp_session.c, returning an incorrect v…KEVEPSS 99%analysed9.8CVE-2019-11043PHP-FPM buffer overflow enables remote code executionPHP-FPM in certain configurations writes past allocated buffers into FCGI protocol data space, an out-of-bounds write (CWE-787, CWE-120). It affects …KEVEPSS 100%analysed9.8CVE-2019-16928Exim heap buffer overflow in string_vformat via long EHLO commandExim 4.92 through 4.92.2 contains a heap-based buffer overflow in string_vformat in string.c triggered by a long EHLO command, allowing remote code e…KEVEPSS 42%analysed9.8CVE-2019-10149Exim MTA improper recipient validation leads to remote command executionExim versions 4.87 through 4.91 fail to properly validate recipient addresses in the deliver_message() function in /src/deliver.c, allowing command i…KEVEPSS 100%analysed9.8CVE-2018-6789Exim SMTP base64d buffer overflow allows remote code executionExim before 4.90.1 contains a buffer overflow in the base64d function of its SMTP listener. A handcrafted message can trigger the overflow, and the f…KEVEPSS 82%analysed9.8CVE-2016-8735Apache Tomcat JmxRemoteLifecycleListener remote code executionApache Tomcat's JmxRemoteLifecycleListener was not updated to match the Oracle CVE-2016-3427 credential-type fix, leaving a deserialization weakness …KEVEPSS 90%analysed9.8CVE-2016-3427Oracle Java SE JMX Improper Access Control VulnerabilityCVE-2016-3427 is an unspecified vulnerability in Oracle Java SE 6u113, 7u99, 8u77, Java SE Embedded 8u77, and JRockit R28.3.9, reached through vector…KEVEPSS 92%analysed

Source: NIST National Vulnerability Database (record CVE-2020-12692), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.