UBUNTU-CVE-2025-8671

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Source
https://ubuntu.com/security/CVE-2025-8671
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-8671.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2025-8671
Upstream
Published
2025-08-15T00:00:00Z
Modified
2025-08-22T17:01:17Z
Severity
  • 7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

A mismatch caused by client-triggered server-sent stream resets between HTTP/2 specifications and the internal architectures of some HTTP/2 implementations may result in excessive server resource consumption leading to denial-of-service (DoS). By opening streams and then rapidly triggering the server to reset them—using malformed frames or flow control errors—an attacker can exploit incorrect stream accounting. Streams reset by the server are considered closed at the protocol level, even though backend processing continues. This allows a client to cause the server to handle an unbounded number of concurrent streams on a single connection. This CVE will be updated as affected product details are released.

References

Affected packages

Ubuntu:Pro:14.04:LTS / lighttpd

Package

Name
lighttpd
Purl
pkg:deb/ubuntu/lighttpd@1.4.33-1+nmu2ubuntu2.1+esm1?arch=source&distro=esm-infra-legacy/trusty

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

1.*

1.4.31-3ubuntu3
1.4.33-1ubuntu1
1.4.33-1+nmu2ubuntu1
1.4.33-1+nmu2ubuntu2
1.4.33-1+nmu2ubuntu2.1
1.4.33-1+nmu2ubuntu2.1+esm1

Ubuntu:Pro:14.04:LTS / varnish

Package

Name
varnish
Purl
pkg:deb/ubuntu/varnish@3.0.5-2ubuntu0.1?arch=source&distro=esm-infra-legacy/trusty

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

3.*

3.0.4-1ubuntu1
3.0.4-1ubuntu2
3.0.5-1ubuntu2
3.0.5-2
3.0.5-2ubuntu0.1

Ubuntu:Pro:16.04:LTS / lighttpd

Package

Name
lighttpd
Purl
pkg:deb/ubuntu/lighttpd@1.4.35-4ubuntu2.1+esm1?arch=source&distro=esm-apps/xenial

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

1.*

1.4.35-4ubuntu1
1.4.35-4ubuntu2
1.4.35-4ubuntu2.1
1.4.35-4ubuntu2.1+esm1

Ubuntu:Pro:16.04:LTS / varnish

Package

Name
varnish
Purl
pkg:deb/ubuntu/varnish@4.1.1-1ubuntu0.2+esm1?arch=source&distro=esm-apps/xenial

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

4.*

4.0.3-1
4.1.0-1
4.1.0-2
4.1.1-1
4.1.1-1ubuntu0.2
4.1.1-1ubuntu0.2+esm1

Ubuntu:Pro:18.04:LTS / h2o

Package

Name
h2o
Purl
pkg:deb/ubuntu/h2o@2.2.4+dfsg-1ubuntu0.1~esm2?arch=source&distro=esm-apps/bionic

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

2.*

2.2.3+dfsg-2
2.2.4+dfsg-1
2.2.4+dfsg-1build1
2.2.4+dfsg-1ubuntu0.1~esm2

Ubuntu:Pro:18.04:LTS / lighttpd

Package

Name
lighttpd
Purl
pkg:deb/ubuntu/lighttpd@1.4.45-1ubuntu3.18.04.1+esm1?arch=source&distro=esm-apps/bionic

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

1.*

1.4.45-1ubuntu1
1.4.45-1ubuntu3
1.4.45-1ubuntu3+esm1
1.4.45-1ubuntu3.18.04
1.4.45-1ubuntu3.18.04+esm1
1.4.45-1ubuntu3.18.04.1
1.4.45-1ubuntu3.18.04.1+esm1

Ubuntu:Pro:18.04:LTS / varnish

Package

Name
varnish
Purl
pkg:deb/ubuntu/varnish@5.2.1-1ubuntu0.1+esm1?arch=source&distro=esm-apps/bionic

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

5.*

5.0.0-7.1
5.2.1-1
5.2.1-1ubuntu0.1
5.2.1-1ubuntu0.1+esm1

Ubuntu:Pro:20.04:LTS / h2o

Package

Name
h2o
Purl
pkg:deb/ubuntu/h2o@2.2.5+dfsg2-3build1?arch=source&distro=esm-apps/focal

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

2.*

2.2.5+dfsg2-3
2.2.5+dfsg2-3build1

Ubuntu:Pro:20.04:LTS / lighttpd

Package

Name
lighttpd
Purl
pkg:deb/ubuntu/lighttpd@1.4.55-1ubuntu1.20.04.2?arch=source&distro=esm-apps/focal

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

1.*

1.4.53-4ubuntu2
1.4.54-2ubuntu1
1.4.55-1ubuntu1
1.4.55-1ubuntu1.20.04.1
1.4.55-1ubuntu1.20.04.2

Ubuntu:Pro:20.04:LTS / varnish

Package

Name
varnish
Purl
pkg:deb/ubuntu/varnish@6.2.1-2ubuntu0.2+esm1?arch=source&distro=esm-apps/focal

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

6.*

6.1.1-1
6.2.1-2
6.2.1-2ubuntu0.1~esm1
6.2.1-2ubuntu0.1~esm2
6.2.1-2ubuntu0.1
6.2.1-2ubuntu0.2
6.2.1-2ubuntu0.2+esm1

Ubuntu:22.04:LTS / h2o

Package

Name
h2o
Purl
pkg:deb/ubuntu/h2o@2.2.5+dfsg2-6.1ubuntu2?arch=source&distro=jammy

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

2.*

2.2.5+dfsg2-6
2.2.5+dfsg2-6.1
2.2.5+dfsg2-6.1ubuntu1
2.2.5+dfsg2-6.1ubuntu2

Ubuntu:22.04:LTS / lighttpd

Package

Name
lighttpd
Purl
pkg:deb/ubuntu/lighttpd@1.4.63-1ubuntu3.1?arch=source&distro=jammy

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

1.*

1.4.59-1ubuntu2
1.4.59-1ubuntu3
1.4.63-1ubuntu1
1.4.63-1ubuntu2
1.4.63-1ubuntu3
1.4.63-1ubuntu3.1

Ubuntu:22.04:LTS / varnish

Package

Name
varnish
Purl
pkg:deb/ubuntu/varnish@6.6.1-1ubuntu0.2?arch=source&distro=jammy

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

6.*

6.5.2-1
6.6.1-1
6.6.1-1ubuntu0.2

Ubuntu:24.04:LTS / h2o

Package

Name
h2o
Purl
pkg:deb/ubuntu/h2o@2.2.5+dfsg2-8.1ubuntu3?arch=source&distro=noble

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

2.*

2.2.5+dfsg2-7
2.2.5+dfsg2-8
2.2.5+dfsg2-8.1ubuntu1
2.2.5+dfsg2-8.1ubuntu2
2.2.5+dfsg2-8.1ubuntu3

Ubuntu:24.04:LTS / lighttpd

Package

Name
lighttpd
Purl
pkg:deb/ubuntu/lighttpd@1.4.74-1ubuntu3?arch=source&distro=noble

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

1.*

1.4.69-1ubuntu1
1.4.69-1ubuntu2
1.4.73-1ubuntu1
1.4.73-1ubuntu2
1.4.74-1ubuntu2
1.4.74-1ubuntu3

Ubuntu:24.04:LTS / varnish

Package

Name
varnish
Purl
pkg:deb/ubuntu/varnish@7.1.1-1.1ubuntu1?arch=source&distro=noble

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

7.*

7.1.1-1.1ubuntu1

Ubuntu:25.04 / h2o

Package

Name
h2o
Purl
pkg:deb/ubuntu/h2o@2.2.5+dfsg2-11?arch=source&distro=plucky

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

2.*

2.2.5+dfsg2-8.1ubuntu3
2.2.5+dfsg2-11~build
2.2.5+dfsg2-11

Ubuntu:25.04 / lighttpd

Package

Name
lighttpd
Purl
pkg:deb/ubuntu/lighttpd@1.4.79-1ubuntu1?arch=source&distro=plucky

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

1.*

1.4.76-1ubuntu1
1.4.76-1ubuntu2
1.4.76-1ubuntu3
1.4.77-1ubuntu1
1.4.79-1ubuntu1

Ubuntu:25.04 / varnish

Package

Name
varnish
Purl
pkg:deb/ubuntu/varnish@7.7.0-1?arch=source&distro=plucky

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

7.*

7.5.0-3
7.7.0-1