CVE-2019-3822
libcurl versions from 7.36.0 to before 7.64.0 are vulnerable to a stack-based buffer overflow.
Does this matter?
EPSS puts the probability of exploitation in the next 30 days at 12.9%, higher than 96% of all known CVEs. Patch or mitigate before the next change window.
Description
libcurl versions from 7.36.0 to before 7.64.0 are vulnerable to a stack-based buffer overflow. The function creating an outgoing NTLM type-3 header (`lib/vauth/ntlm.c:Curl_auth_create_ntlm_type3_message()`), generates the request HTTP header contents based on previously received data. The check that exists to prevent the local buffer from getting overflowed is implemented wrongly (using unsigned math) and as such it does not prevent the overflow from happening. This output data can grow larger than the local buffer if very large 'nt response' data is extracted from a previous NTLMv2 header provided by the malicious or broken HTTP server. Such a 'large value' needs to be around 1000 bytes or more. The actual payload data copied to the target buffer comes from the NTLMv2 type-2 response header.
- CVSS 3.1
- 9.8 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 12.87% probability · 96th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-121, CWE-787
- Affected
- haxx/libcurl · canonical/ubuntu linux · debian/debian linux · netapp/active iq unified manager · netapp/clustered data ontap · netapp/oncommand insight · netapp/oncommand workflow automation · netapp/snapcenter · siemens/sinema remote connect client · oracle/communications operations monitor · oracle/enterprise manager ops center · oracle/http server · oracle/mysql server · oracle/secure global desktop · oracle/services tools bundle · redhat/enterprise linux
- Source
- secalert@redhat.com
EPSS 12.9% since 26 October 2026; no change recorded yet. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- http://www.securityfocus.com/bid/106950Third Party Advisory, VDB Entry
- https://access.redhat.com/errata/RHSA-2019:3701Third Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-3822Exploit, Issue Tracking, Patch, Third Party Advisory
- https://cert-portal.siemens.com/productcert/pdf/ssa-436177.pdfThird Party Advisory
- https://curl.haxx.se/docs/CVE-2019-3822.htmlPatch, Vendor Advisory
- https://lists.apache.org/thread.html/8338a0f605bdbb3a6098bb76f666a95fc2b2f53f37fa1ecc89f1146f%40%3Cdevnull.infra.apache.org%3E
- https://security.gentoo.org/glsa/201903-03Third Party Advisory
- https://security.netapp.com/advisory/ntap-20190315-0001/Patch, Third Party Advisory
- https://security.netapp.com/advisory/ntap-20190719-0004/Third Party Advisory
- https://support.f5.com/csp/article/K84141449Third Party Advisory
- https://support.f5.com/csp/article/K84141449?utm_source=f5support&%3Butm_medium=RSS
- https://usn.ubuntu.com/3882-1/Third Party Advisory
- https://www.debian.org/security/2019/dsa-4386Third Party Advisory
- https://www.oracle.com/technetwork/security-advisory/cpuapr2019-5072813.htmlPatch, Third Party Advisory
- https://www.oracle.com/technetwork/security-advisory/cpujul2019-5072835.htmlPatch, Third Party Advisory
- http://www.securityfocus.com/bid/106950Third Party Advisory, VDB Entry
- https://access.redhat.com/errata/RHSA-2019:3701Third Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-3822Exploit, Issue Tracking, Patch, Third Party Advisory
- https://cert-portal.siemens.com/productcert/pdf/ssa-436177.pdfThird Party Advisory
- https://curl.haxx.se/docs/CVE-2019-3822.htmlPatch, Vendor Advisory
- https://lists.apache.org/thread.html/8338a0f605bdbb3a6098bb76f666a95fc2b2f53f37fa1ecc89f1146f%40%3Cdevnull.infra.apache.org%3E
- https://security.gentoo.org/glsa/201903-03Third Party Advisory
- https://security.netapp.com/advisory/ntap-20190315-0001/Patch, Third Party Advisory
- https://security.netapp.com/advisory/ntap-20190719-0004/Third Party Advisory
- https://support.f5.com/csp/article/K84141449Third Party Advisory
- https://support.f5.com/csp/article/K84141449?utm_source=f5support&%3Butm_medium=RSS
- https://usn.ubuntu.com/3882-1/Third Party Advisory
- https://www.debian.org/security/2019/dsa-4386Third Party Advisory
- https://www.oracle.com/technetwork/security-advisory/cpuapr2019-5072813.htmlPatch, Third Party Advisory
- https://www.oracle.com/technetwork/security-advisory/cpujul2019-5072835.htmlPatch, Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.