The GnuTLS backend in libcurl 7.21.4 through 7.33.0, when disabling digital signature…
Priority LOW 24CWE-20Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- — Not recorded in CVSS 2.0
- Attack complexity
- High
- Impact type
- —
- Confidentiality · integrity · availability
- Partial · Partial · None
- Fix status
- No fix listed
Attack profile from CVSS 2.0 · NVD. Fix status from CNA.
Summary
The GnuTLS backend in libcurl 7.21.4 through 7.33.0, when disabling digital signature verification (CURLOPT_SSL_VERIFYPEER), also disables the CURLOPT_SSL_VERIFYHOST check for CN or SAN host name fields, which makes it easier for remote attackers to spoof servers and conduct man-in-the-middle (MITM) attacks.
Why it matters now
EPSS 0.02798 86th percentileScored 2026-11-07
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 · 23
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:debian:debian_linux:7.0:*:*:*:*:*:*:* | 7.0 | Vulnerable | Debian |
| cpe:2.3:o:canonical:ubuntu_linux:12.04:-:lts:*:*:*:*:* | 12.04 | Vulnerable | Canonical |
| cpe:2.3:o:canonical:ubuntu_linux:12.10:*:*:*:*:*:*:* | 12.10 | Vulnerable | Canonical |
| cpe:2.3:o:canonical:ubuntu_linux:13.04:*:*:*:*:*:*:* | 13.04 | Vulnerable | Canonical |
| cpe:2.3:o:canonical:ubuntu_linux:13.10:*:*:*:*:*:*:* | 13.10 | Vulnerable | Canonical |
| cpe:2.3:a:haxx:libcurl:7.21.4:*:*:*:*:*:*:* | 7.21.4 | Vulnerable | Haxx |
| cpe:2.3:a:haxx:libcurl:7.21.5:*:*:*:*:*:*:* | 7.21.5 | Vulnerable | Haxx |
| cpe:2.3:a:haxx:libcurl:7.21.6:*:*:*:*:*:*:* | 7.21.6 | Vulnerable | Haxx |
| cpe:2.3:a:haxx:libcurl:7.21.7:*:*:*:*:*:*:* | 7.21.7 | Vulnerable | Haxx |
| cpe:2.3:a:haxx:libcurl:7.22.0:*:*:*:*:*:*:* | 7.22.0 | Vulnerable | Haxx |
- cpe:2.3:o:debian:debian_linux:7.0:*:*:*:*:*:*:* Versions 7.0 Vulnerable ·Debian
- cpe:2.3:o:canonical:ubuntu_linux:12.04:-:lts:*:*:*:*:* Versions 12.04 Vulnerable ·Canonical
- cpe:2.3:o:canonical:ubuntu_linux:12.10:*:*:*:*:*:*:* Versions 12.10 Vulnerable ·Canonical
- cpe:2.3:o:canonical:ubuntu_linux:13.04:*:*:*:*:*:*:* Versions 13.04 Vulnerable ·Canonical
- cpe:2.3:o:canonical:ubuntu_linux:13.10:*:*:*:*:*:*:* Versions 13.10 Vulnerable ·Canonical
- cpe:2.3:a:haxx:libcurl:7.21.4:*:*:*:*:*:*:* Versions 7.21.4 Vulnerable ·Haxx
- cpe:2.3:a:haxx:libcurl:7.21.5:*:*:*:*:*:*:* Versions 7.21.5 Vulnerable ·Haxx
- cpe:2.3:a:haxx:libcurl:7.21.6:*:*:*:*:*:*:* Versions 7.21.6 Vulnerable ·Haxx
- cpe:2.3:a:haxx:libcurl:7.21.7:*:*:*:*:*:*:* Versions 7.21.7 Vulnerable ·Haxx
- cpe:2.3:a:haxx:libcurl:7.22.0:*:*:*:*:*:*:* Versions 7.22.0 Vulnerable ·Haxx
Show 13 more CPE
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:haxx:libcurl:7.23.0:*:*:*:*:*:*:* | 7.23.0 | Vulnerable | Haxx |
| cpe:2.3:a:haxx:libcurl:7.23.1:*:*:*:*:*:*:* | 7.23.1 | Vulnerable | Haxx |
| cpe:2.3:a:haxx:libcurl:7.24.0:*:*:*:*:*:*:* | 7.24.0 | Vulnerable | Haxx |
| cpe:2.3:a:haxx:libcurl:7.25.0:*:*:*:*:*:*:* | 7.25.0 | Vulnerable | Haxx |
| cpe:2.3:a:haxx:libcurl:7.26.0:*:*:*:*:*:*:* | 7.26.0 | Vulnerable | Haxx |
| cpe:2.3:a:haxx:libcurl:7.27.0:*:*:*:*:*:*:* | 7.27.0 | Vulnerable | Haxx |
| cpe:2.3:a:haxx:libcurl:7.28.0:*:*:*:*:*:*:* | 7.28.0 | Vulnerable | Haxx |
| cpe:2.3:a:haxx:libcurl:7.28.1:*:*:*:*:*:*:* | 7.28.1 | Vulnerable | Haxx |
| cpe:2.3:a:haxx:libcurl:7.29.0:*:*:*:*:*:*:* | 7.29.0 | Vulnerable | Haxx |
| cpe:2.3:a:haxx:libcurl:7.30.0:*:*:*:*:*:*:* | 7.30.0 | Vulnerable | Haxx |
| cpe:2.3:a:haxx:libcurl:7.31.0:*:*:*:*:*:*:* | 7.31.0 | Vulnerable | Haxx |
| cpe:2.3:a:haxx:libcurl:7.32.0:*:*:*:*:*:*:* | 7.32.0 | Vulnerable | Haxx |
| cpe:2.3:a:haxx:libcurl:7.33.0:*:*:*:*:*:*:* | 7.33.0 | Vulnerable | Haxx |
- cpe:2.3:a:haxx:libcurl:7.23.0:*:*:*:*:*:*:* Versions 7.23.0 Vulnerable ·Haxx
- cpe:2.3:a:haxx:libcurl:7.23.1:*:*:*:*:*:*:* Versions 7.23.1 Vulnerable ·Haxx
- cpe:2.3:a:haxx:libcurl:7.24.0:*:*:*:*:*:*:* Versions 7.24.0 Vulnerable ·Haxx
- cpe:2.3:a:haxx:libcurl:7.25.0:*:*:*:*:*:*:* Versions 7.25.0 Vulnerable ·Haxx
- cpe:2.3:a:haxx:libcurl:7.26.0:*:*:*:*:*:*:* Versions 7.26.0 Vulnerable ·Haxx
- cpe:2.3:a:haxx:libcurl:7.27.0:*:*:*:*:*:*:* Versions 7.27.0 Vulnerable ·Haxx
- cpe:2.3:a:haxx:libcurl:7.28.0:*:*:*:*:*:*:* Versions 7.28.0 Vulnerable ·Haxx
- cpe:2.3:a:haxx:libcurl:7.28.1:*:*:*:*:*:*:* Versions 7.28.1 Vulnerable ·Haxx
- cpe:2.3:a:haxx:libcurl:7.29.0:*:*:*:*:*:*:* Versions 7.29.0 Vulnerable ·Haxx
- cpe:2.3:a:haxx:libcurl:7.30.0:*:*:*:*:*:*:* Versions 7.30.0 Vulnerable ·Haxx
- cpe:2.3:a:haxx:libcurl:7.31.0:*:*:*:*:*:*:* Versions 7.31.0 Vulnerable ·Haxx
- cpe:2.3:a:haxx:libcurl:7.32.0:*:*:*:*:*:*:* Versions 7.32.0 Vulnerable ·Haxx
- cpe:2.3:a:haxx:libcurl:7.33.0:*:*:*:*:*:*:* Versions 7.33.0 Vulnerable ·Haxx
Remediation
No fixed version listed by the sources yet.
Vendor assessments
Red Hat
Red Hat rating: Low. Red Hat's page for this CVE →
Not affected: 3 products
- Red Hat Enterprise Linux 5
- Red Hat Enterprise Linux 6
- Red Hat Enterprise Linux 7
Timeline
- 2026-10-02 Threatist record created from CVE-2013-6422
- 2026-10-03 Alias added: GHSA-fw5f-w62r-p5ww
References
Sources
- CVE-2013-6422 · CVE Program
- CVE-2013-6422 · NVD
- FIRST EPSS
- GHSA-fw5f-w62r-p5ww · GitHub Advisory Database · CC BY 4.0
- CVE-2013-6422 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences