🛡️ CVE-2023-44487 on Ubuntu — dnsdist

⚪ Unknown ✅ No Known Exploit OSV

N/A

CVSS Score

0 Low4 Medium7 High9 Critical10

Description

The HTTP/2 protocol allows a denial of service (server resource consumption) because request cancellation can reset many streams quickly, as exploited in the wild in August through October 2023.

Distribution advisory

This page covers CVE-2023-44487 as tracked by Ubuntu, for the package dnsdist. The fix is available in version 1.6.1-1ubuntu0.1~esm1; earlier versions remain affected.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs no privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality none, integrity none, availability high.

CVSS metrics in full

The score comes from this vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack vector: Network — reachable from anywhere that can route to the service.
Attack complexity: Low — the attack works reliably, with no preparation.
Privileges required: None — an unauthenticated stranger can try it.
User interaction: None — nobody has to be tricked into anything.
Scope: Unchanged — the damage stays inside the vulnerable component.
Confidentiality impact: None.
Integrity impact: None.
Availability impact: High — total loss, or loss the attacker controls.

Weakness class

UBUNTU-CVE-2023-44487 is classified as CWE-400: Uncontrolled Resource Consumption. A request can consume memory, CPU or storage without limit, exhausting capacity for everyone else.

Affected software

UBUNTU-CVE-2023-44487 is recorded against 12 packages.

dnsdist (fixed in 1.6.1-1ubuntu0.1~esm1)
dotnet6 (fixed in 6.0.123-0ubuntu1~22.04.1)
dotnet7 (fixed in 7.0.112-0ubuntu1~22.04.1)
dotnet8 (fixed in 8.0.100-8.0.0-0ubuntu1)
h2o (fixed in 2.2.5+dfsg2-6.1ubuntu2+esm1)
haproxy (fixed in 1.8.8-1ubuntu0.13+esm3)
netty (fixed in 1:4.1.48-4+deb11u2build0.22.04.1)
nghttp2 (fixed in 1.43.0-1ubuntu0.1)
nodejs (fixed in 12.22.9~dfsg-1ubuntu3.6+esm2)
tomcat8 (fixed in 8.5.39-1ubuntu1~18.04.3+esm4)
tomcat9 (fixed in 9.0.58-1ubuntu0.2)
trafficserver (fixed in 9.1.1+ds-2ubuntu0.1~esm1)

Timeline and source

Published on 10 October 2023 and last revised on 22 April 2026. No public exploit is currently recorded for this entry. Record sourced from OSV.

References

Other advisories for this package

dnsdist has other advisories on record. If you are patching this one, these are worth checking on the same host:

UBUNTU-CVE-2026-52682 (published 7 Aug 2026)
DEBIAN-CVE-2026-52682 (published 6 Aug 2026)
openSUSE-SU-2026:21533-1 (published 5 Aug 2026)
openSUSE-SU-2026:11411-1 (published 31 Jul 2026)
UBUNTU-CVE-2026-54340 (published 17 Jul 2026)
UBUNTU-CVE-2026-44453 (published 16 Jul 2026)
UBUNTU-CVE-2026-44452 (published 16 Jul 2026)
UBUNTU-CVE-2026-55213 (published 10 Jul 2026)

Same weakness in other software

These advisories are the same class of weakness (CWE-400: Uncontrolled Resource Consumption) in other software:

CVE-2024-25039 (7.5 High, published 30 Jul 2026)
CVE-2024-24769 (2.0 Low, published 13 Jul 2026)
CVE-2022-21732 (5.0 Medium, published 9 Jul 2026)
CVE-2022-23591 (8.0 High, published 9 Jul 2026)
CVE-2024-12537 (8.0 High, published 7 Jul 2026)
CVE-2023-46104 (5.0 Medium, published 7 Jul 2026)
CVE-2024-10821 (8.0 High, published 7 Jul 2026)
CVE-2024-12778 (8.0 High, published 7 Jul 2026)

CVE-2023-44487 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Alpine — ALPINE-CVE-2023-44487 BellSoft — BELL-CVE-2023-44487 Base record — CVE-2023-44487 Debian — DEBIAN-CVE-2023-44487 Maven (Root.io) — ROOT-APP-MAVEN-CVE-2023-44487 Debian 11 (Root.io) — ROOT-OS-DEBIAN-11-CVE-2023-44487 Debian 12 (Root.io) — ROOT-OS-DEBIAN-12-CVE-2023-44487

Details

Severity Unknown

CVSS Score N/A

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

CWE N/A

Public Exploit ✅ No

Source OSV

Published 2023-10-10

Updated 2026-08-20

Modified 2026-04-22

Fix URL N/A

Affected Packages

Software	From version	Fixed in
dnsdist	—	1.6.1-1ubuntu0.1~esm1
dotnet6	—	6.0.123-0ubuntu1~22.04.1
dotnet7	—	7.0.112-0ubuntu1~22.04.1
dotnet8	—	8.0.100-8.0.0-0ubuntu1
h2o	—	2.2.5+dfsg2-6.1ubuntu2+esm1
haproxy	—	1.8.8-1ubuntu0.13+esm3
netty	—	1:4.1.48-4+deb11u2build0.22.04.1
nghttp2	—	1.43.0-1ubuntu0.1
nodejs	—	12.22.9~dfsg-1ubuntu3.6+esm2
tomcat8	—	8.5.39-1ubuntu1~18.04.3+esm4
tomcat9	—	9.0.58-1ubuntu0.2
trafficserver	—	9.1.1+ds-2ubuntu0.1~esm1

References

REPORT https://ubuntu.com/security/CVE-2023-44487

REPORT https://blog.cloudflare.com/zero-day-rapid-reset-http2-record-breaking-ddos-attack/

REPORT https://blog.cloudflare.com/technical-breakdown-http2-rapid-reset-ddos-attack/

REPORT https://www.mail-archive.com/[email protected]/msg44134.html

REPORT https://www.nginx.com/blog/http-2-rapid-reset-attack-impacting-f5-nginx-products/

REPORT https://my.f5.com/manage/s/article/K000137106

REPORT https://mailman.nginx.org/pipermail/nginx-devel/2023-October/S36Q5HBXR7CAIMPLLPRSSSYR4PCMWILK.html

REPORT https://www.mail-archive.com/[email protected]/msg44134.html

REPORT https://devblogs.microsoft.com/dotnet/october-2023-updates/

ADVISORY https://ubuntu.com/security/notices/USN-6427-1

REPORT https://github.com/nghttp2/nghttp2/releases/tag/v1.57.0

REPORT https://groups.google.com/g/golang-announce/c/iNNxDTCjZvo

ADVISORY https://ubuntu.com/security/notices/USN-6427-2

ADVISORY https://ubuntu.com/security/notices/USN-6438-1

REPORT https://nodejs.org/en/blog/vulnerability/october-2023-security-releases

ADVISORY https://ubuntu.com/security/notices/USN-6505-1

ADVISORY https://ubuntu.com/security/notices/USN-6574-1

REPORT https://www.cve.org/CVERecord?id=CVE-2023-44487

ADVISORY https://ubuntu.com/security/notices/USN-6754-1

REPORT https://www.cisa.gov/known-exploited-vulnerabilities-catalog

ADVISORY https://ubuntu.com/security/notices/USN-6994-1

ADVISORY https://ubuntu.com/security/notices/USN-7067-1

ADVISORY https://ubuntu.com/security/notices/USN-7410-1

REPORT https://tomcat.apache.org/security-8.html

REPORT https://lists.apache.org/thread/5py8h42mxfsn8l1wy6o41xwhsjlsd87q

ADVISORY https://ubuntu.com/security/notices/USN-7469-1

ADVISORY https://ubuntu.com/security/notices/USN-7469-2

ADVISORY https://ubuntu.com/security/notices/USN-7469-3

ADVISORY https://ubuntu.com/security/notices/USN-7469-4

REPORT https://blog.powerdns.com/2024/02/16/powerdns-dnsdist-1.9.0-released

REPORT https://mailman.powerdns.com/pipermail/dnsdist/2023-October/001409.html

ADVISORY https://ubuntu.com/security/notices/USN-7892-1

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🛡️ CVE-2023-44487 on Ubuntu — dnsdist

Description

Distribution advisory

How this vulnerability can be exploited

CVSS metrics in full

Weakness class

Affected software

Timeline and source

References

Other advisories for this package

Same weakness in other software

CVE-2023-44487 on other distributions

Is dnsdist part of your stack?

Browse related advisories

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