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CVE-2019-1549

24
FAUCET Score

CVE-2019-1549 describes a vulnerability in OpenSSL versions 1.1.1 through 1.1.1c, where the newly rewritten random number generator (RNG) failed to properly protect against shared state between parent and child processes after a fork() system call. This could lead to predictable RNG outputs in certain scenarios. Rated as MEDIUM severity (CVSS 5.3), the vulnerability has a network attack vector and low attack complexity, potentially leading to a loss of confidentiality (C:L). However, a high-precision timer partially mitigates the issue by mixing additional entropy into the RNG state. There is no evidence of active exploitation, and no public exploit code is available (Metasploit, Nuclei, ExploitDB). Community discussion and media coverage for this CVE are minimal, indicating low public attention.

Impacted Technologies

VendorProductVersion(s)CPE
>= 1.1.1, <= 1.1.1cCPE matchmatch criteria
cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

5.3MEDIUM

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
LOW
Integrity Impact
NONE
Availability Impact
NONE
Exploitability Score
3.9
Impact Score
1.4
CvssVersion
3.1

Exploit Intelligence

EPSS Score
6.23%
Probability of exploitation in next 30 days
EPSS Percentile
92.8%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0623 is in the 90th percentile among its peer group of 23,723 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (14)

redhatpatch availablevia redhat_api
Product: JBoss Core Services Apache HTTP Server 2.4.37 SP2Fixed in: openssl
View patch
redhatpatch availablevia redhat_api
Product: JBoss Core Services on RHEL 6Fixed in: jbcs-httpd24-apr-0:1.6.3-86.jbcs.el6
View patch
redhatpatch availablevia redhat_api
Product: JBoss Core Services on RHEL 6Fixed in: jbcs-httpd24-brotli-0:1.0.6-21.jbcs.el6
View patch
redhatpatch availablevia redhat_api
Product: JBoss Core Services on RHEL 6Fixed in: jbcs-httpd24-httpd-0:2.4.37-52.jbcs.el6
View patch
redhatpatch availablevia redhat_api
Product: JBoss Core Services on RHEL 6Fixed in: jbcs-httpd24-mod_cluster-native-0:1.3.12-41.Final_redhat_2.jbcs.el6
View patch
redhatpatch availablevia redhat_api
Product: JBoss Core Services on RHEL 6Fixed in: jbcs-httpd24-mod_http2-0:1.11.3-22.jbcs.el6
View patch
redhatpatch availablevia redhat_api
Product: JBoss Core Services on RHEL 6Fixed in: jbcs-httpd24-openssl-1:1.1.1c-16.jbcs.el6
View patch
redhatpatch availablevia redhat_api
Product: JBoss Core Services on RHEL 7Fixed in: jbcs-httpd24-apr-0:1.6.3-86.jbcs.el7
View patch
redhatpatch availablevia redhat_api
Product: JBoss Core Services on RHEL 7Fixed in: jbcs-httpd24-brotli-0:1.0.6-21.jbcs.el7
View patch
redhatpatch availablevia redhat_api
Product: JBoss Core Services on RHEL 7Fixed in: jbcs-httpd24-httpd-0:2.4.37-52.jbcs.el7
View patch
redhatpatch availablevia redhat_api
Product: JBoss Core Services on RHEL 7Fixed in: jbcs-httpd24-mod_cluster-native-0:1.3.12-41.Final_redhat_2.jbcs.el7
View patch
redhatpatch availablevia redhat_api
Product: JBoss Core Services on RHEL 7Fixed in: jbcs-httpd24-mod_http2-0:1.11.3-22.jbcs.el7
View patch
redhatpatch availablevia redhat_api
Product: JBoss Core Services on RHEL 7Fixed in: jbcs-httpd24-openssl-1:1.1.1c-16.jbcs.el7
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 8Fixed in: openssl-1:1.1.1c-15.el8
View patch

Vendor Advisories (2)

microsoft2019-Sep/CVE-2019-1549Moderate

Fork Protection

Sep 10, 2019
redhatCVE-2019-1549Low

openssl: information disclosure in fork()

Sep 10, 2019

References

git.openssl.org / gitweb
lists.fedoraproject.org / archives/list/package-announce%40lists.fedoraproject.org/message/GY6SNRJP2S7Y42GIIDO3HXPNMDYN2U3A
lists.fedoraproject.org / archives/list/package-announce%40lists.fedoraproject.org/message/ZN4VVQJ3JDCHGIHV4Y2YTXBYQZ6PWQ7E
seclists.org / bugtraq/2019/Oct/1
security.netapp.com / advisory/ntap-20190919-0002
support.f5.com / csp/article/K44070243
support.f5.com / csp/article/K44070243
usn.ubuntu.com / 4376-1
debian.org / security/2019/dsa-4539
openssl.org / news/secadv/20190910.txt
Vendor Advisory
oracle.com / security-alerts/cpuapr2020.html
oracle.com / security-alerts/cpujan2020.html
oracle.com / security-alerts/cpujul2020.html
oracle.com / security-alerts/cpuoct2020.html
oracle.com / technetwork/security-advisory/cpuoct2019-5072832.html