CVE-2017-3731
HighIf an SSL/TLS server or client is running on a 32-bit host, and a specific cipher is being used, then a truncated packet can cause that server or client to perform an out-of-bounds read, usually resulting in a crash.
Published May 4, 2017 · Updated Aug 4, 2026 · Also known as ALPINE-CVE-2017-3731, DEBIAN-CVE-2017-3731, UBUNTU-CVE-2017-3731
Key Facts
Patch immediately- CVE-2017-3731 is a high-severity vulnerability (CVSS 7.5 v3.1) affecting Node.js (Nodejs), OpenSSL, lib32-openssl (arch) and 22 more products.
- It is not listed in any known-exploited vulnerabilities catalog. No public exploit code is known.
- EPSS estimates a 57% probability of exploitation in the next 30 days.
- Fixed versions are available, including jbcs-httpd24-apache-commons-daemon 0:1.1.0-1.redhat_2.1.jbcs.el6, jbcs-httpd24-apache-commons-daemon 0:1.1.0-1.redhat_2.1.jbcs.el7, jbcs-httpd24-apache-commons-daemon-jsvc 1:1.1.0-1.redhat_2.jbcs.el6.
- Brandefense priority: patch immediately, because it is very likely to be exploited soon.
CVSS v3.1
7.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS (30-day exploit likelihood)
57%
Higher than 99.0% of all scored CVEs
Exploited in the wild
No known
Not in a known-exploited catalog
Public exploit code
None known
Get the full CVE-2017-3731 brief as a PDF
Every affected product and fixed release, exploitation status and a first 24 hours response checklist, emailed within minutes.
Description
If an SSL/TLS server or client is running on a 32-bit host, and a specific cipher is being used, then a truncated packet can cause that server or client to perform an out-of-bounds read, usually resulting in a crash. For OpenSSL 1.1.0, the crash can be triggered when using CHACHA20/POLY1305; users should upgrade to 1.1.0d. For Openssl 1.0.2, the crash can be triggered when using RC4-MD5; users who have not disabled that algorithm should update to 1.0.2k.
Affected Products
229 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| Node.jsNodejs | See advisory | 4.1.2 |
| OpenSSLOpenssl | 1.0.2, 1.0.2a, 1.0.2b, 1.0.2-beta1, 1.0.2-beta2, 1.0.2-beta3, 1.0.2c, 1.0.2d | 1.0.2.k-1 |
| lib32-opensslarch | See advisory | 1:1.0.2.k-1 |
| rootio-opensslrootio | See advisory | 1.1.0d-1 |
| openssl-develamazon | See advisory | 1:1.0.1k-15.99.amzn1 |
Patched Releases
jbcs-httpd24-apache-commons-daemon
0:1.1.0-1.redhat_2.1.jbcs.el6, 0:1.1.0-1.redhat_2.1.jbcs.el7
jbcs-httpd24-apache-commons-daemon-jsvc
1:1.1.0-1.redhat_2.jbcs.el6, 1:1.1.0-1.redhat_2.jbcs.el7
jbcs-httpd24-apr
0:1.6.3-14.jbcs.el6, 0:1.6.3-14.jbcs.el7
jbcs-httpd24-apr-util
0:1.6.1-9.jbcs.el6, 0:1.6.1-9.jbcs.el7
jbcs-httpd24-httpd
0:2.4.29-17.jbcs.el6, 0:2.4.29-17.jbcs.el7
jbcs-httpd24-mod_auth_kerb
0:5.4-36.jbcs.el6, 0:5.4-36.jbcs.el7
jbcs-httpd24-mod_bmx
0:0.9.6-17.GA.jbcs.el6, 0:0.9.6-17.GA.jbcs.el7
jbcs-httpd24-mod_cluster-native
0:1.3.8-1.Final_redhat_2.jbcs.el6, 0:1.3.8-1.Final_redhat_2.jbcs.el7
jbcs-httpd24-mod_jk
0:1.2.43-1.redhat_1.jbcs.el6, 0:1.2.43-1.redhat_1.jbcs.el7
jbcs-httpd24-mod_rt
0:2.4.1-19.GA.jbcs.el6, 0:2.4.1-19.GA.jbcs.el7
jbcs-httpd24-mod_security
0:2.9.1-23.GA.jbcs.el6, 0:2.9.1-23.GA.jbcs.el7
jbcs-httpd24-nghttp2
0:1.29.0-8.jbcs.el6, 0:1.29.0-8.jbcs.el7
jbcs-httpd24-openssl
1:1.0.2n-11.jbcs.el6, 1:1.0.2n-11.jbcs.el7
lib32-openssl
1:1.0.2.k-1
libmysql56client_r18
5.6.38-30.1
libmysql56client_r18-32bit
5.6.38-30.1
libmysql56client18
5.6.38-30.1
libmysql56client18-32bit
5.6.38-30.1
libopenssl-1_0_0-devel
1.0.2u-6.2
libopenssl-1_0_0-devel-32bit
1.0.2u-6.2
libopenssl-1_1-devel
1.1.1l-1.2
libopenssl-1_1-devel-32bit
1.1.1l-1.2
libopenssl-devel
1.0.1i-21.1, 1.0.1i-54.5.1, 1.0.2j-4.1, 1.0.2j-59.1, 1.1.1l-1.2
libopenssl-devel-32bit
1.0.1i-21.1, 1.0.2j-4.1
libopenssl1_0_0
1.0.1g-0.57.1, 1.0.1i-21.1, 1.0.1i-27.28.1, 1.0.1i-54.5.1, 1.0.2j-4.1, 1.0.2j-59.1, 1.0.2u-6.2
Timeline
Publicly disclosed
May 4, 2017
Last updated
Aug 4, 2026
Weakness Type
- CWE-125 Out-of-bounds Read
References
- advisoryRHSA-2017:0286
- advisoryRHSA-2017:0286
- advisoryRHSA-2018:2185
- advisoryRHSA-2018:2186
- advisoryRHSA-2018:2187
FAQ
Common Questions.
If an SSL/TLS server or client is running on a 32-bit host, and a specific cipher is being used, then a truncated packet can cause that server or client to perform an out-of-bounds read, usually resulting in a crash.
Affected: Node.js (Nodejs); OpenSSL versions 1.0.2, 1.0.2a, 1.0.2b, 1.0.2-beta1, 1.0.2-beta2, 1.0.2-beta3, 1.0.2c, 1.0.2d; lib32-openssl (arch), among others. The full list is in the CVE brief.
It is not listed in any known-exploited vulnerabilities catalog.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
No public exploit code is known.
Fixed versions are available, including jbcs-httpd24-apache-commons-daemon 0:1.1.0-1.redhat_2.1.jbcs.el6, jbcs-httpd24-apache-commons-daemon 0:1.1.0-1.redhat_2.1.jbcs.el7, jbcs-httpd24-apache-commons-daemon-jsvc 1:1.1.0-1.redhat_2.jbcs.el6.
Brandefense priority: patch immediately, because it is very likely to be exploited soon.
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