OCSP stapling bypass with GnuTLS
Published Sep 11, 2024
6.5
MEDIUMCVSS 3.1
EPSS 0.73%
Description
When curl is told to use the Certificate Status Request TLS extension, often referred to as OCSP stapling, to verify that the server certificate is valid, it might fail to detect some OCSP problems and instead wrongly consider the response as fine. If the returned status reports another error than 'revoked' (like for example 'unauthorized') it is not treated as a bad certficate.
Affected products
-
- Version 7.41.0StatusaffectedConstraints<=7.41.0
- Version 7.42.0StatusaffectedConstraints<=7.42.0
- Version 7.42.1StatusaffectedConstraints<=7.42.1
- Version 7.43.0StatusaffectedConstraints<=7.43.0
- Version 7.44.0StatusaffectedConstraints<=7.44.0
- Version 7.45.0StatusaffectedConstraints<=7.45.0
- Version 7.46.0StatusaffectedConstraints<=7.46.0
- Version 7.47.0StatusaffectedConstraints<=7.47.0
- Version 7.47.1StatusaffectedConstraints<=7.47.1
- Version 7.48.0StatusaffectedConstraints<=7.48.0
- Version 7.49.0StatusaffectedConstraints<=7.49.0
- Version 7.49.1StatusaffectedConstraints<=7.49.1
- Version 7.50.0StatusaffectedConstraints<=7.50.0
- Version 7.50.1StatusaffectedConstraints<=7.50.1
- Version 7.50.2StatusaffectedConstraints<=7.50.2
- Version 7.50.3StatusaffectedConstraints<=7.50.3
- Version 7.51.0StatusaffectedConstraints<=7.51.0
- Version 7.52.0StatusaffectedConstraints<=7.52.0
- Version 7.52.1StatusaffectedConstraints<=7.52.1
- Version 7.53.0StatusaffectedConstraints<=7.53.0
- Version 7.53.1StatusaffectedConstraints<=7.53.1
- Version 7.54.0StatusaffectedConstraints<=7.54.0
- Version 7.54.1StatusaffectedConstraints<=7.54.1
- Version 7.55.0StatusaffectedConstraints<=7.55.0
- Version 7.55.1StatusaffectedConstraints<=7.55.1
- Version 7.56.0StatusaffectedConstraints<=7.56.0
- Version 7.56.1StatusaffectedConstraints<=7.56.1
- Version 7.57.0StatusaffectedConstraints<=7.57.0
- Version 7.58.0StatusaffectedConstraints<=7.58.0
- Version 7.59.0StatusaffectedConstraints<=7.59.0
- Version 7.60.0StatusaffectedConstraints<=7.60.0
- Version 7.61.0StatusaffectedConstraints<=7.61.0
- Version 7.61.1StatusaffectedConstraints<=7.61.1
- Version 7.62.0StatusaffectedConstraints<=7.62.0
- Version 7.63.0StatusaffectedConstraints<=7.63.0
- Version 7.64.0StatusaffectedConstraints<=7.64.0
- Version 7.64.1StatusaffectedConstraints<=7.64.1
- Version 7.65.0StatusaffectedConstraints<=7.65.0
- Version 7.65.1StatusaffectedConstraints<=7.65.1
- Version 7.65.2StatusaffectedConstraints<=7.65.2
- Version 7.65.3StatusaffectedConstraints<=7.65.3
- Version 7.66.0StatusaffectedConstraints<=7.66.0
- Version 7.67.0StatusaffectedConstraints<=7.67.0
- Version 7.68.0StatusaffectedConstraints<=7.68.0
- Version 7.69.0StatusaffectedConstraints<=7.69.0
- Version 7.69.1StatusaffectedConstraints<=7.69.1
- Version 7.70.0StatusaffectedConstraints<=7.70.0
- Version 7.71.0StatusaffectedConstraints<=7.71.0
- Version 7.71.1StatusaffectedConstraints<=7.71.1
- Version 7.72.0StatusaffectedConstraints<=7.72.0
- Version 7.73.0StatusaffectedConstraints<=7.73.0
- Version 7.74.0StatusaffectedConstraints<=7.74.0
- Version 7.75.0StatusaffectedConstraints<=7.75.0
- Version 7.76.0StatusaffectedConstraints<=7.76.0
- Version 7.76.1StatusaffectedConstraints<=7.76.1
- Version 7.77.0StatusaffectedConstraints<=7.77.0
- Version 7.78.0StatusaffectedConstraints<=7.78.0
- Version 7.79.0StatusaffectedConstraints<=7.79.0
- Version 7.79.1StatusaffectedConstraints<=7.79.1
- Version 7.80.0StatusaffectedConstraints<=7.80.0
- Version 7.81.0StatusaffectedConstraints<=7.81.0
- Version 7.82.0StatusaffectedConstraints<=7.82.0
- Version 7.83.0StatusaffectedConstraints<=7.83.0
- Version 7.83.1StatusaffectedConstraints<=7.83.1
- Version 7.84.0StatusaffectedConstraints<=7.84.0
- Version 7.85.0StatusaffectedConstraints<=7.85.0
- Version 7.86.0StatusaffectedConstraints<=7.86.0
- Version 7.87.0StatusaffectedConstraints<=7.87.0
- Version 7.88.0StatusaffectedConstraints<=7.88.0
- Version 7.88.1StatusaffectedConstraints<=7.88.1
- Version 8.0.0StatusaffectedConstraints<=8.0.0
- Version 8.0.1StatusaffectedConstraints<=8.0.1
- Version 8.1.0StatusaffectedConstraints<=8.1.0
- Version 8.1.1StatusaffectedConstraints<=8.1.1
- Version 8.1.2StatusaffectedConstraints<=8.1.2
- Version 8.2.0StatusaffectedConstraints<=8.2.0
- Version 8.2.1StatusaffectedConstraints<=8.2.1
- Version 8.3.0StatusaffectedConstraints<=8.3.0
- Version 8.4.0StatusaffectedConstraints<=8.4.0
- Version 8.5.0StatusaffectedConstraints<=8.5.0
- Version 8.6.0StatusaffectedConstraints<=8.6.0
- Version 8.7.0StatusaffectedConstraints<=8.7.0
- Version 8.7.1StatusaffectedConstraints<=8.7.1
- Version 8.8.0StatusaffectedConstraints<=8.8.0
- Version 8.9.0StatusaffectedConstraints<=8.9.0
- Version 8.9.1StatusaffectedConstraints<=8.9.1
- Version
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Curl | Curl | unaffected |
|
Configuration 2
- 11.0
Configuration 3
- n/a
- n/a
- 10
Configuration 4
- n/a
Running on/with
- n/a
Configuration 5
- n/a
Configuration 6
- n/a
Configuration 7
- n/a
Configuration 8
- n/a
-
- Version 7.41.0StatusaffectedConstraints<=8.9.1
- Version
Red Hat Enterprise Linux 10
curl
Not affected
Red Hat Enterprise Linux 6
curl
Out of support scope
Red Hat Enterprise Linux 7
curl
Not affected
Red Hat Enterprise Linux 8
curl
Not affected
Red Hat Enterprise Linux 9
curl
Not affected
Red Hat JBoss Core Services
jbcs-httpd24-curl
Not affected
Red Hat OpenShift Container Platform 4
rhcos
Will not fix
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 10 | curl | Not affected | n/a |
| Red Hat Enterprise Linux 6 | curl | Out of support scope | n/a |
| Red Hat Enterprise Linux 7 | curl | Not affected | n/a |
| Red Hat Enterprise Linux 8 | curl | Not affected | n/a |
| Red Hat Enterprise Linux 9 | curl | Not affected | n/a |
| Red Hat JBoss Core Services | jbcs-httpd24-curl | Not affected | n/a |
| Red Hat OpenShift Container Platform 4 | rhcos | Will not fix | n/a |
No package ranges for this CVE.
Remediation
Red Hat statement
The vulnerability in curl related to OCSP stapling is classified as moderate severity rather than important because it only affects the validation of server certificates under specific conditions: when using the GnuTLS library and when the OCSP response indicates an error other than "revoked", such as "unauthorized". This limits the attack surface, as the issue does not result in outright failure to detect revoked certificates, arguably the most critical OCSP check. Additionally, OCSP stapling is not widely implemented across the web, reducing the likelihood of widespread exploitation.
Red Hat mitigation
Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.
Metrics
No CVSS v4.0 score for this CVE.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
No CVSS v3.0 score for this CVE.
No CVSS v2.0 score for this CVE.
This CVE is not in the KEV list.
CISA SSVC (Vulnrichment)
Stakeholder-Specific Vulnerability Categorization from CISA ADP.
Exploitation
NoneAutomatable
YesTechnical Impact
PartialDecision
n/aAssessed Sep 11, 2024 · SSVC 2.0.3
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
Score over time
2024–2026- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (5 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 0.73% (0.00729) | 52.54th | v5 (v2026.06.15) |
| Jun 15, 2026 | 0.74% (0.00745) | 49.77th | v5 (v2026.06.15) |
| Mar 17, 2025 | 0.08% (0.00076) | 20.35th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.04% (0.00045) | 17.70th | v3 (v2023.03.01) |
| Sep 12, 2024 | 0.04% (0.00045) | 16.35th | v3 (v2023.03.01) |
References (10)
- http://www.openwall.com/lists/oss-security/2024/09/11/1 Mailing ListThird Party Advisory
- https://access.redhat.com/security/cve/CVE-2024-8096 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2310519 Issue Tracking
- https://curl.se/docs/CVE-2024-8096.html Vendor Advisory
- https://curl.se/docs/CVE-2024-8096.json Vendor Advisory
- https://hackerone.com/reports/2669852 ExploitIssue TrackingThird Party Advisory
- https://lists.debian.org/debian-lts-announce/2024/11/msg00008.html Mailing ListThird Party Advisory
- https://nvd.nist.gov/vuln/detail/CVE-2024-8096
- https://security.netapp.com/advisory/ntap-20241011-0005/ Third Party Advisory
- https://www.cve.org/CVERecord?id=CVE-2024-8096
| Link | Providers | Tags |
|---|---|---|
| http://www.openwall.com/lists/oss-security/2024/09/11/1 | Mailing ListThird Party Advisory | |
| https://access.redhat.com/security/cve/CVE-2024-8096 | Vendor Advisory | |
| https://bugzilla.redhat.com/show_bug.cgi?id=2310519 | Issue Tracking | |
| https://curl.se/docs/CVE-2024-8096.html | Vendor Advisory | |
| https://curl.se/docs/CVE-2024-8096.json | Vendor Advisory | |
| https://hackerone.com/reports/2669852 | ExploitIssue TrackingThird Party Advisory | |
| https://lists.debian.org/debian-lts-announce/2024/11/msg00008.html | Mailing ListThird Party Advisory | |
| https://nvd.nist.gov/vuln/detail/CVE-2024-8096 | ||
| https://security.netapp.com/advisory/ntap-20241011-0005/ | Third Party Advisory | |
| https://www.cve.org/CVERecord?id=CVE-2024-8096 |
Change history (0)
No recorded changes yet.