CVE-2019-19794
miekg/dns insecurely generates random numbers
CVE-2019-19794 is a medium vulnerability (CVSS 5.9) in Miekg-dns Project Miekg-dns, published December 13, 2019. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 2.07%, the 81st percentile. Fixed in github.com/miekg/dns 1.1.25.
- Severity
- 5.9 MediumCVSS 3.1, NVD
- Exploit chance
- 2.07%EPSS, 81st percentile
- Exploitation
- None knownNot on CISA’s or ENISA’s lists
- Fixed in
1.1.25github.com/miekg/dns +6 more
Description
The miekg Go DNS package before 1.1.25, as used in CoreDNS before 1.6.6 and other products, improperly generates random numbers because math/rand is used. The TXID becomes predictable, leading to response forgeries.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- High
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- None
- Integrity
- High
- Availability
- None
Exploit likelihood
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
github.com/miekg/dnsGo | before 1.1.25 | 1.1.25 |
golang-github-miekg-dnsDebian:12 | before 1.1.26-1 | 1.1.26-1 |
golang-github-miekg-dnsDebian:13 | before 1.1.26-1 | 1.1.26-1 |
golang-github-miekg-dnsDebian:14 | before 1.1.26-1 | 1.1.26-1 |
github.com/miekg/dnsGo | before 1.1.25-0.20191211073109-8ebf2e419df7 | 1.1.25-0.20191211073109-8ebf2e419df7 |
golang-github-miekg-dnsUbuntu:18.04:LTS | All versions, plus listed versions 0.0~git20170501.0.f282f80-20.0~git20170501.0.f282f80-3 | None known |
golang-github-miekg-dnsUbuntu:20.04:LTS | All versions, plus listed versions 1.0.4+ds-1ubuntu1 | None known |
What each source reports
NVD Score used
The miekg Go DNS package before 1.1.25, as used in CoreDNS before 1.6.6 and other products, improperly generates random numbers because math/rand is used. The TXID becomes predictable, leading to response forgeries.
- Record
CVE-2019-19794- CVSS 3.1
- 5.9 Medium
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N - CVSS 2.0
- 4.3 Medium
AV:N/AC:M/Au:N/C:N/I:P/A:N - Weakness
- CWE-338
- Updated
- 2026-11-02
CVE ListNo score
The miekg Go DNS package before 1.1.25, as used in CoreDNS before 1.6.6 and other products, improperly generates random numbers because math/rand is used. The TXID becomes predictable, leading to response forgeries.
- Record
CVE-2019-19794- Updated
- 2026-11-02
EUVDEUVD-2021-0929No score
The miekg Go DNS package before 1.1.25, as used in CoreDNS before 1.6.6 and other products, improperly generates random numbers because math/rand is used. The TXID becomes predictable, leading to response forgeries.
- Record
EUVD-2021-0929- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-44r7-7p62-q3fr
miekg/dns insecurely generates random numbers
The miekg Go DNS package before 1.1.25, as used in CoreDNS before 1.6.6 and other products, improperly generates random numbers because math/rand is used. The TXID becomes predictable, leading to response forgeries.
- Record
GHSA-44r7-7p62-q3fr- CVSS 3.1
- 5.9 Medium
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N - Weakness
- CWE-330, CWE-338
- Updated
- 2026-11-02
OSV
The miekg Go DNS package before 1.1.25, as used in CoreDNS before 1.6.6 and other products, improperly generates random numbers because math/rand is used. The TXID becomes predictable, leading to response forgeries.
- Record
CVE-2019-19794- CVSS 3.1
- 5.9 Medium
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N - Updated
- 2026-11-02
OSVDEBIAN-CVE-2019-19794
The miekg Go DNS package before 1.1.25, as used in CoreDNS before 1.6.6 and other products, improperly generates random numbers because math/rand is used. The TXID becomes predictable, leading to response forgeries.
- Record
DEBIAN-CVE-2019-19794- CVSS 3.1
- 5.9 Medium
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N - Updated
- 2026-11-02
OSVGHSA-44r7-7p62-q3fr
miekg/dns insecurely generates random numbers
The miekg Go DNS package before 1.1.25, as used in CoreDNS before 1.6.6 and other products, improperly generates random numbers because math/rand is used. The TXID becomes predictable, leading to response forgeries.
- Record
GHSA-44r7-7p62-q3fr- CVSS 3.1
- 5.9 Medium
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N - Weakness
- CWE-330, CWE-338
- Updated
- 2026-11-02
OSVUBUNTU-CVE-2019-19794
The miekg Go DNS package before 1.1.25, as used in CoreDNS before 1.6.6 and other products, improperly generates random numbers because math/rand is used. The TXID becomes predictable, leading to response forgeries.
- Record
UBUNTU-CVE-2019-19794- CVSS 3.1
- 5.9 Medium
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N - Updated
- 2026-11-02
OSVGO-2020-0008No score
Insecure generation of random numbers in github.com/miekg/dns
DNS message transaction IDs are generated using math/rand which makes them relatively predictable. This reduces the complexity of response spoofing attacks against DNS clients.
- Record
GO-2020-0008- Updated
- 2026-11-02
History
| Recorded | Changed | Sources |
|---|---|---|
| facts | ||
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.