$ cve CVE-2017-1000257 JSON

CVE-2017-1000257

9.1

CRITICAL · CVSS 3.1 · EPSS 6.2% (pctl 93)

In your normal cycle

Critical by CVSS (9.1), but no sign of active exploitation.

Description

An IMAP FETCH response line indicates the size of the returned data, in number of bytes. When that response says the data is zero bytes, libcurl would pass on that (non-existing) data with a pointer and the size (zero) to the deliver-data function. libcurl's deliver-data function treats zero as a magic number and invokes strlen() on the data to figure out the length. The strlen() is called on a heap based buffer that might not be zero terminated so libcurl might read beyond the end of it into whatever memory lies after (or just crash) and then deliver that to the application as if it was actually downloaded.

Scoring

CVSS	9.1 (CRITICAL, v3.1)
Vector	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
EPSS	6.22% — more likely to be exploited than 93% of all CVEs
Weakness	CWE-119
On CISA KEV	no
Public exploit	none known
Published	2017-10-31
Last modified	2026-06-17

Affected (2)

Vendor	Product
debian	debian linux
haxx	libcurl

References

→ the Explorer · watch your stack · NVD