X.509 Name Constraints Read Buffer Overflow
Noroxi assessment
Priority: Monitor (action score 19/100)
- The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
- Probability of exploitation in the next 30 days: 1.3% (FIRST EPSS); higher than 71.7% of all records.
- Anyone who can reach it over the internet can trigger it. Administrator privileges are required. No user action is required. No special conditions are required; it is repeatable.
- Fixed version: OpenSSL OpenSSL 3.0.8.
- Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).
Low priority for now. Upgrade to OpenSSL OpenSSL 3.0.8 or later.
Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it
Primary sources: NVD · CVE.org · FIRST EPSS
A read buffer overrun can be triggered in X.509 certificate verification, specifically in name constraint checking. Note that this occurs after certificate chain signature verification and requires either a CA to have signed the malicious certificate or for the application to continue certificate verification despite failure to construct a path to a trusted issuer. The read buffer overrun might result in a crash which could lead to a denial of service attack. In theory it could also result in the disclosure of private memory contents (such as private keys, or sensitive plaintext) although we are not aware of any working exploit leading to memory contents disclosure as of the time of release of this advisory. In a TLS client, this can be triggered by connecting to a malicious server. In a TLS server, this can be triggered if the server requests client authentication and a malicious client connects.
- Published
- Feb 24, 2023
- Updated
- Jun 17, 2026
- EPSS
- 1.3% · 71th percentile
- CWE
- CWE-125
Report tools
Action score
19
Monitor
Low priority for now.
- CVSS
- 19 / 40 · 4.9 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 0 / 30 · 1.3%
CISA SSVC decision
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
Vulnrichment: CISA's decision-tree inputs.
Get told when this record changes
- Not in KEV: no record of exploitation in the wild
- No public exploit code on record
- A fix has been released
If any of these changes, we'll tell you in the daily email digest.
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Noroxi analysis
What does it mean in your environment?
The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.
We use this product, ask for helpAffected systems
Is your version affected?
Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.
| Vendor | Product | CPE |
|---|---|---|
| openssl | openssl | cpe:2.3:a:openssl:openssl |
Check your server's TLS configuration
The OpenSSL version can't be seen from outside; the free SSL checker tests your certificate, enabled TLS versions and weak ciphers. Confirm the version on your server with the package manager.
Run the SSL checkAffected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- openssl openssl3.0.0 and later · before 3.0.8
Versions reported by the vendor
Affected version ranges reported by the assigning authority (openssl). Independent of NVD's CPE analysis and usually ahead of it.
OpenSSL OpenSSL
- 3.0.0 and later · before 3.0.8affected · semver
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| AlmaLinux:9 | openssl | before 1:3.0.1-47.el9_1 | 1:3.0.1-47.el9_1 |
| AlmaLinux:9 | openssl-devel | before 1:3.0.1-47.el9_1 | 1:3.0.1-47.el9_1 |
| AlmaLinux:9 | openssl-libs | before 1:3.0.1-47.el9_1 | 1:3.0.1-47.el9_1 |
| AlmaLinux:9 | openssl-perl | before 1:3.0.1-47.el9_1 | 1:3.0.1-47.el9_1 |
| Alpine:v3.15 | openssl3 | before 3.0.8-r0 | 3.0.8-r0 |
| Alpine:v3.17 | openssl | from 3.0.0 · before 3.0.8-r0 | 3.0.8-r0 |
| crates.io | openssl-src | from 300.0.0 · before 300.0.12 | 300.0.12 |
| Debian:12 | openssl | before 3.0.8-1 | 3.0.8-1 |
| openSUSE:Tumbleweed | openssl-3 | before 3.0.8-1.1 | 3.0.8-1.1 |
| Red Hat:enterprise_linux:9::appstream | openssl-debuginfo | before 1:3.0.1-47.el9_1 | 1:3.0.1-47.el9_1 |
| Red Hat:enterprise_linux:9::appstream | openssl-debugsource | before 1:3.0.1-47.el9_1 | 1:3.0.1-47.el9_1 |
| Red Hat:enterprise_linux:9::appstream | openssl-devel | before 1:3.0.1-47.el9_1 | 1:3.0.1-47.el9_1 |
| Red Hat:enterprise_linux:9::appstream | openssl-libs-debuginfo | before 1:3.0.1-47.el9_1 | 1:3.0.1-47.el9_1 |
| Red Hat:enterprise_linux:9::appstream | openssl-perl | before 1:3.0.1-47.el9_1 | 1:3.0.1-47.el9_1 |
| Red Hat:enterprise_linux:9::baseos | openssl | before 1:3.0.1-47.el9_1 | 1:3.0.1-47.el9_1 |
| Red Hat:enterprise_linux:9::baseos | openssl-libs | before 1:3.0.1-47.el9_1 | 1:3.0.1-47.el9_1 |
| Red Hat:rhel_eus:9.0::appstream | openssl-debuginfo | before 1:3.0.1-46.el9_0 | 1:3.0.1-46.el9_0 |
| Red Hat:rhel_eus:9.0::appstream | openssl-debugsource | before 1:3.0.1-46.el9_0 | 1:3.0.1-46.el9_0 |
| Red Hat:rhel_eus:9.0::appstream | openssl-devel | before 1:3.0.1-46.el9_0 | 1:3.0.1-46.el9_0 |
| Red Hat:rhel_eus:9.0::appstream | openssl-libs-debuginfo | before 1:3.0.1-46.el9_0 | 1:3.0.1-46.el9_0 |
| Red Hat:rhel_eus:9.0::appstream | openssl-perl | before 1:3.0.1-46.el9_0 | 1:3.0.1-46.el9_0 |
| Red Hat:rhel_eus:9.0::baseos | openssl | before 1:3.0.1-46.el9_0 | 1:3.0.1-46.el9_0 |
| Red Hat:rhel_eus:9.0::baseos | openssl-libs | before 1:3.0.1-46.el9_0 | 1:3.0.1-46.el9_0 |
| Rocky Linux:9 | openssl | before 1:3.0.1-47.el9_1 | 1:3.0.1-47.el9_1 |
+2
Same product
openssl: all recordsOther highest-scoring records for the same primary product.
- CVE-2014-0160The (1) TLS and (2) DTLS implementations in OpenSSL 1.0.1 before 1.0.1g do not properly handle Heartbeat Extension packets, which allows remKEV90Now
- CVE-2021-3711SM2 Decryption Buffer Overflow65This week
- CVE-2003-0545Double free vulnerability in OpenSSL 0.9.7 allows remote attackers to cause a denial of service (crash) and possibly execute arbitrary code 65This week
Published before and after this one in the same product
- ← EarlierCVE-2023-0215Feb 8, 2023 · Use-after-free following BIO_new_NDEF32Monitor
- ← EarlierCVE-2023-0286Feb 8, 2023 · X.400 address type confusion in X.509 GeneralName50Plan
- Later →CVE-2023-0464Mar 22, 2023 · Excessive Resource Usage Verifying X.509 Policy Constraints31Monitor
Remediation
Which version to upgrade to
Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.
| Product / package | Fixed version | Source |
|---|---|---|
| OpenSSL OpenSSL | 3.0.8 | Vendor (CNA) |
| almalinux:openssl | 1:3.0.1-47.el9_1 · AlmaLinux:9 | Package registry (OSV) |
| almalinux:openssl-devel | 1:3.0.1-47.el9_1 · AlmaLinux:9 | Package registry (OSV) |
| almalinux:openssl-libs | 1:3.0.1-47.el9_1 · AlmaLinux:9 | Package registry (OSV) |
| almalinux:openssl-perl | 1:3.0.1-47.el9_1 · AlmaLinux:9 | Package registry (OSV) |
| alpine:openssl | 3.0.8-r0 · Alpine:v3.17 | Package registry (OSV) |
| alpine:openssl3 | 3.0.8-r0 · Alpine:v3.15 | Package registry (OSV) |
| crates.io:openssl-src | 300.0.12 | Package registry (OSV) |
| debian:openssl | 3.0.8-1 · Debian:12 | Package registry (OSV) |
| opensuse:openssl-3 | 3.0.1-150400.4.17.1 · openSUSE:Leap 15.4 | Package registry (OSV) |
| red hat:openssl | 1:3.0.1-47.el9_1 · Red Hat:enterprise_linux:9::baseos | Package registry (OSV) |
| red hat:openssl-debuginfo | 1:3.0.1-47.el9_1 · Red Hat:enterprise_linux:9::appstream | Package registry (OSV) |
| red hat:openssl-debugsource | 1:3.0.1-47.el9_1 · Red Hat:enterprise_linux:9::appstream | Package registry (OSV) |
| red hat:openssl-devel | 1:3.0.1-47.el9_1 · Red Hat:enterprise_linux:9::appstream | Package registry (OSV) |
| red hat:openssl-libs | 1:3.0.1-47.el9_1 · Red Hat:enterprise_linux:9::baseos | Package registry (OSV) |
| red hat:openssl-libs-debuginfo | 1:3.0.1-47.el9_1 · Red Hat:enterprise_linux:9::appstream | Package registry (OSV) |
| red hat:openssl-perl | 1:3.0.1-47.el9_1 · Red Hat:enterprise_linux:9::appstream | Package registry (OSV) |
| rocky linux:openssl | 1:3.0.1-47.el9_1 · Rocky Linux:9 | Package registry (OSV) |
| suse:openssl-3 | 3.0.1-150400.4.17.1 · SUSE:Linux Enterprise Module for Basesystem 15 SP4 | Package registry (OSV) |
Exploit status
No known public exploit
No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.
Research context
For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.
Timeline
From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.
No dated events beyond publication.
FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).
Patch and commit links
Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.
Credits
All researchersFinders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.
- Viktor Dukhovniremediation developer
- Corey BonnellDigicertfinder
Variant candidates
Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.
No nightly-computed relations.
Chain candidates
An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.
—
Bug bounty scope
No known public program.
Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).
National notice (Türkiye Cybersecurity Directorate / USOM)
Official security notices citing this record; remediation advice is on the agency's page.
- TR-23-0067 · Feb 8, 2023(OpenSSL Güvenlik Güncellemesi )
Technical details
Attack conditions
- Anyone who can reach it over the internet can trigger it.
- Administrator privileges are required.
- No user action is required.
- No special conditions are required; it is repeatable.
If successful
- Confidentiality
- none
- Integrity
- none
- Availability
- high · the service can be disrupted
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- High
- User interaction
- None
- Scope
- Unchanged
- Confidentiality impact
- None
- Integrity impact
- None
- Availability impact
- High
Weakness class (CWE)
CWE-125 · Out-of-bounds ReadCVSS vector
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
nvd-primary
Attack context
MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.
Attack patterns (CAPEC)
ATT&CK techniques
—
Change log
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
Show all references (3 more)Show less
Vendor advisories and official records. Exploit/PoC links are deliberately left out.