In sig_verify() in x509.c in axTLS version 2.1.3 and before, the PKCS#1 v1.5 signature…
Priority LOW 28CWE-347Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- High
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- No fix listed
Attack profile from CVSS 3.0 · NVD. Fix status from CNA. Impact type from CWE-347.
Summary
In sig_verify() in x509.c in axTLS version 2.1.3 and before, the PKCS#1 v1.5 signature verification blindly trusts the declared lengths in the ASN.1 structure. Consequently, when small public exponents are being used, a remote attacker can generate purposefully crafted signatures (and put them on X.509 certificates) to induce illegal memory access and crash the verifier.
Why it matters now
EPSS 0.00696 53rd percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix No fix listed No fixed version in the sources yet
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:axtls_project:axtls:*:*:*:*:*:*:*:* | up to 2.1.3 | Vulnerable | Axtls Project |
- cpe:2.3:a:axtls_project:axtls:*:*:*:*:*:*:*:* Versions up to 2.1.3 Vulnerable ·Axtls Project
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2018-16149
- 2026-10-03 Alias added: GHSA-9955-wg6r-ggm9
References
More Axtls Project Axtls vulnerabilities
- TI-2019-06472 tls1.c in Cameron Hamilton-Rich axTLS before 2.1.5 has a Buffer Overflow via a crafted… CVSS 3.0CRITICAL 9.8
- TI-2019-07349 The asn1_signature function in asn1.c in Cameron Hamilton-Rich axTLS through 2.1.5 has a… CVSS 3.1HIGH 7.5
- TI-2019-07090 process_certificate in tls1.c in Cameron Hamilton-Rich axTLS through 2.1.5 has a Buffer… CVSS 3.1HIGH 7.5
- TI-2018-11638 In sig_verify() in x509.c in axTLS version 2.1.3 and before, the PKCS#1 v1.5 signature… CVSS 3.0MEDIUM 5.9
- TI-2018-11549 In sig_verify() in x509.c in axTLS version 2.1.3 and before, the PKCS#1 v1.5 signature… CVSS 3.0MEDIUM 5.9
- TI-2017-14635 axTLS version 1.5.3 has a coding error in the ASN.1 parser resulting in the year (19)50… CVSS 3.0MEDIUM 5.3
Sources
- CVE-2018-16149 · CVE Program
- CVE-2018-16149 · NVD
- FIRST EPSS
- GHSA-9955-wg6r-ggm9 · GitHub Advisory Database · CC BY 4.0
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