CVE-2016-8622

LOWNVD 3.79.8▲
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2022-05-14. NVD baseline CVSS 3.7; sources differ by 6.1.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
3.7
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 5%CVSS: 3.7Exploit: NoneExposed: 0

A fix is available — apply it.

The URL percent-encoding decode function in libcurl before 7.51.0 is called curl_easy_unescape. Internally, even if this function would be made to allocate a unscape destination buffer larger than 2GB, it would return that new length in a signed 32 bit integer variable, thus the length would get either just truncated or both truncated and turned negative. That could then lead to libcurl writing outside of its heap based buffer.

CVSS v3
3.7
EG Score
9.8(medium)
EPSS
90.7%
KEV
Not listed

Published

July 31, 2018

Last Modified

November 21, 2024

References (18)

Vendor Advisories for CVE-2016-8622(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Frequently asked(5)

What is CVE-2016-8622?
CVE-2016-8622 is a low vulnerability published on July 31, 2018. The URL percent-encoding decode function in libcurl before 7.51.0 is called curleasyunescape. Internally, even if this function would be made to allocate a unscape destination buffer larger than 2GB, it would return that new length in a signed 32 bit integer variable, thus the length would get…
When was CVE-2016-8622 disclosed?
CVE-2016-8622 was first published in the National Vulnerability Database on July 31, 2018, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2016-8622 actively exploited?
CVE-2016-8622 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 90.7% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2016-8622?
CVE-2016-8622 has a CVSS v3 base score of 3.7 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 9.8.
How do I remediate CVE-2016-8622?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2016-8622, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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