In sig_verify() in x509.c in axTLS version 2.1.3 and before, the PKCS#1 v1.5 signature…
Priority LOW 27CWE-347Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- High
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- None · High · None
- 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 does not properly verify the ASN.1 metadata. Consequently, a remote attacker can forge signatures when small public exponents are being used, which could lead to impersonation through fake X.509 certificates. This is an even more permissive variant of CVE-2006-4790 and CVE-2014-1568.
Why it matters now
EPSS 0.00618 49th 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-2018-16253
- 2026-10-03 Alias added: GHSA-g43p-7j43-jpj7
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-2018-11548 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-2018-16253 · CVE Program
- CVE-2018-16253 · NVD
- FIRST EPSS
- GHSA-g43p-7j43-jpj7 · GitHub Advisory Database · CC BY 4.0
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