CVE-2018-16839
highpriority · track · 41EPSS 0.058 · 93 %ileDEEURUUSEPSS · scored 2026-10-27
Curl versions 7.33.0 through 7.61.1 are vulnerable to a buffer overrun in the SASL authentication code that may lead to denial of service.
cvss
Technical severity, 0–10. One row per scoring source.
base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–critical · 4.3–9.8
ssvc
A stakeholder decision — act, attend, or track — from exploitation and impact.
weaknesses
The CWE weakness classes this flaw belongs to.
affected products (13)
Products and version ranges known to be affected.
advisories (3)
Vendor and ecosystem advisories describing this.
- WID-SEC-W-2023-1641cURL: Mehrere SchwachstellenDeutsch2018-10-30csaf · cert_bundDE
Ein entfernter, anonymer Angreifer kann mehrere Schwachstellen in cURL und libcurl ausnutzen, um Informationen offenzulegen, einen Denial of Service Zustand herbeizuführen und um einen nicht näher spezifizierten Angriff durchzuführen.
- WID-SEC-W-2026-0180Dell Data Protection Advisor: Mehrere SchwachstellenDeutsch2026-01-20csaf · cert_bundDE
Ein Angreifer kann mehrere Schwachstellen in Dell Data Protection Advisor ausnutzen, um beliebigen Code auszuführen, einen Denial-of-Service-Zustand zu erzeugen, Sicherheitsmaßnahmen zu umgehen und nicht näher spezifizierte Angriffe zu starten.
- CURL-CVE-2018-16839SASL password overflow via integer overflow2018-10-31vendor · osvUS
libcurl contains a buffer overrun in the SASL authentication code. The internal function `Curl_auth_create_plain_message` fails to correctly verify that the passed in lengths for name and password are not too long, then calculates a buffer size to allocate. On systems with a 32-bit `size_t`, the math to calculate the buffer size triggers an integer overflow when the username length exceeds 1GB and the password name length is close to 2GB in size. This integer overflow usually causes a tiny buffer to actually get allocated instead of the intended huge one, making the use of that buffer end up in a heap buffer overflow. (This bug is similar to [CVE-2018-14618](https://curl.se/docs/CVE-2018-14618.html).)
also known as (4)
Other names and identifiers for this entity.
sources
Which sources assert this record, and when.
references (34)
External citations — patches, advisories, analysis.
- http://www.securitytracker.com/id/1042012cnnvd
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-16839cnnvd
- https://curl.haxx.se/docs/CVE-2018-16839.htmlcnnvd
- https://github.com/curl/curl/commit/f3a24d7916b9173c69a3e0ee790102993833d6c5cnnvd
- https://lists.apache.org/thread.html/8338a0f605bdbb3a6098bb76f666a95fc2b2f53f37fa1ecc89f1146f@%3Cdevnull.infra.apache.org%3Ecnnvd
- https://lists.debian.org/debian-lts-announce/2018/11/msg00005.htmlcnnvd
- https://packetstormsecurity.com/files/152034/Gentoo-Linux-Security-Advisory-201903-03.htmlcnnvd
- https://security.gentoo.org/glsa/201903-03cnnvd
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