How severe is CVE-2017-1000099?

CVE-2017-1000099 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2017-1000099 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (86th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2017-1000099?

CVE-2017-1000099 affects Haxx Libcurl. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2017-1000099?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2017-1000099 published?

CVE-2017-1000099 was published on 2017-10-05 and last updated on 2026-06-17.

CVE-2017-1000099

CVE-2017-1000099 is a medium-severity vulnerability in Haxx Libcurl with a CVSS 3.x base score of 6.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-200.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
CVSS v2: 4.3
EPSS exploit prediction: 3% (86th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-200
Affected product: Haxx Libcurl
Published: 2017-10-05
Last modified: 2026-06-17

Description

When asking to get a file from a file:// URL, libcurl provides a feature that outputs meta-data about the file using HTTP-like headers. The code doing this would send the wrong buffer to the user (stdout or the application's provide callback), which could lead to other private data from the heap to get inadvertently displayed. The wrong buffer was an uninitialized memory area allocated on the heap and if it turned out to not contain any zero byte, it would continue and display the data following that buffer in memory.

Frequently asked questions

What is CVE-2017-1000099?: When asking to get a file from a file:// URL, libcurl provides a feature that outputs meta-data about the file using HTTP-like headers. The code doing this would send the wrong buffer to the user (stdout or the application's provide callback), which could lead to other private data from the heap to get inadvertently displayed. The wrong buffer was an uninitialized memory area allocated on the heap and if it turned out to not contain any zero byte, it would continue and display the data following that buffer in memory.
How severe is CVE-2017-1000099?: CVE-2017-1000099 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2017-1000099 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (86th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2017-1000099?: CVE-2017-1000099 affects Haxx Libcurl. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2017-1000099?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2017-1000099 published?: CVE-2017-1000099 was published on 2017-10-05 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:haxx:libcurl:7.54.1:*:*:*:*:*:*:*

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