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CVE-2021-40540

ulfius_uri_logger in Ulfius HTTP Framework before 2.7.4 omits con_info initialization and a...

9.8 CriticalFix available

ulfius_uri_logger in Ulfius HTTP Framework before 2.7.4 omits con_info initialization and a con_info->request NULL check for certain malformed HTTP requests.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
None
User interaction
None

What an attacker can affect

Confidentiality
High
Integrity
High
Availability
High

Exploit likelihood

2.63%Up 2.0 points since Sep 7, 2021
90%50%10%1%

What each source reports

NVD Score used9.8

ulfius_uri_logger in Ulfius HTTP Framework before 2.7.4 omits con_info initialization and a con_info->request NULL check for certain malformed HTTP requests.

Record
CVE-2021-40540
CVSS 3.1
9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS 2.0
7.5 HighAV:N/AC:L/Au:N/C:P/I:P/A:P
Updated
2026-11-02
CVE ListNo score

ulfius_uri_logger in Ulfius HTTP Framework before 2.7.4 omits con_info initialization and a con_info->request NULL check for certain malformed HTTP requests.

Record
CVE-2021-40540
Updated
2026-11-02
EUVDEUVD-2021-27715No score

ulfius_uri_logger in Ulfius HTTP Framework before 2.7.4 omits con_info initialization and a con_info->request NULL check for certain malformed HTTP requests.

Record
EUVD-2021-27715
Updated
2026-11-03
GitHub AdvisoriesGHSA-jr28-h3mc-x46rNo score

ulfius_uri_logger in Ulfius HTTP Framework before 2.7.4 omits con_info initialization and a...

ulfius_uri_logger in Ulfius HTTP Framework before 2.7.4 omits con_info initialization and a con_info->request NULL check for certain malformed HTTP requests.

Record
GHSA-jr28-h3mc-x46r
Updated
2026-11-02
OSV9.8

ulfius_uri_logger in Ulfius HTTP Framework before 2.7.4 omits con_info initialization and a con_info->request NULL check for certain malformed HTTP requests.

Record
CVE-2021-40540
CVSS 3.1
9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated
2026-11-02
OSVDEBIAN-CVE-2021-405409.8

ulfius_uri_logger in Ulfius HTTP Framework before 2.7.4 omits con_info initialization and a con_info->request NULL check for certain malformed HTTP requests.

Record
DEBIAN-CVE-2021-40540
CVSS 3.1
9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated
2026-11-02
OSVUBUNTU-CVE-2021-405409.8

ulfius_uri_logger in Ulfius HTTP Framework before 2.7.4 omits con_info initialization and a con_info->request NULL check for certain malformed HTTP requests.

Record
UBUNTU-CVE-2021-40540
CVSS 3.1
9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated
2026-11-02
OSVopenSUSE-SU-2024:11481-1No score

libulfius2_7-2.7.4-1.2 on GA media

These are all security issues fixed in the libulfius2_7-2.7.4-1.2 package on the GA media of openSUSE Tumbleweed.

Record
openSUSE-SU-2024:11481-1
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
ulfius
Debian:12
before 2.7.1-2
2.7.1-2
ulfius
Debian:13
before 2.7.1-2
2.7.1-2
ulfius
Debian:14
before 2.7.1-2
2.7.1-2
ulfius
Ubuntu:18.04:LTS
All versions, plus listed versions
2.1.0-12.1.2-12.2.4-1
None known
ulfius
Ubuntu:20.04:LTS
All versions, plus listed versions
2.5.2-4
None known
ulfius
Ubuntu:22.04:LTS
All versions, plus listed versions
2.7.4-1ubuntu32.7.6-1ubuntu12.7.7-1
None known
ulfius
openSUSE:Tumbleweed
before 2.7.4-1.2
2.7.4-1.2

History

History
RecordedChangedSources
aliasesEUVD
first indexedCVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2021-40540 is a critical vulnerability (CVSS 9.8) in Ulfius Project Ulfius, published September 7, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 2.63%, the 85th percentile. Fixed in ulfius 2.7.1-2.

References

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