CVE-2017-0059 — Internet Explorer
MEDIUMCVE-2017-0059 is a medium-severity (CVSS 4.3) vulnerability in microsoft internet explorer. It is in CISA's Known Exploited Vulnerabilities catalog (added 2022-03-28) — treat it as actively exploited and patch now. No vendor fix is recorded yet; mitigation options are listed below.
Microsoft Internet Explorer 9 through 11 allow remote attackers to obtain sensitive information from process memory via a crafted web site, aka "Internet Explorer Information Disclosure…
Exploitation Status
Actively exploited in the wild
- Confirmed by CISA's Known Exploited Vulnerabilities catalog on 2022-03-28. Federal agencies were required to remediate by 2022-04-18.
Exploitation and automatability from CISA (KEV catalog and SSVC triage) for CVE-2017-0059.
EPSS Exploitation Probability
Probability of exploitation in the next 30 days, from FIRST.org EPSS.
How urgent is this, really
CVE-2017-0059 by exploitation likelihood (EPSS) against impact (CVSS). Outside the shaded patch-first corner.
Where this sits among everything scored
Of 395,249 CVEs with a current EPSS score, this one falls in the 50–90% band (highlighted). Counts from FIRST.org, log-scaled.
Description
Microsoft Internet Explorer 9 through 11 allow remote attackers to obtain sensitive information from process memory via a crafted web site, aka "Internet Explorer Information Disclosure Vulnerability." This vulnerability is different from those described in CVE-2017-0008 and CVE-2017-0009.
Affected Products
internet explorermicrosoftResearch use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.
Microsoft Internet Explorer - 'mshtml.dll' Remote Code Execution (MS17-007)
by redr2e · Jul 24, 2017
Microsoft Internet Explorer 11 - 'textarea.defaultValue' Memory Disclosure (MS17-006)
by Google Security Research · Mar 20, 2017
Microsoft Internet Explorer 11 (Windows 7 x86) - 'mshtml.dll' Remote Code Execution (MS17-007)
by mschenk · Oct 17, 2017
Detection & mitigation playbook
Vendor / applianceDetect
Inventory every microsoft internet explorer deployment and check each version against the affected-products list above.
Remediation status
No patch has shipped for CVE-2017-0059 yet — track the microsoft internet explorer advisory for a fixed release and apply the workarounds below in the meantime.
Mitigate without a patch
Assume what was exposed is already known: rotate any credential, token or key that the affected component could return, restrict the endpoint to callers that genuinely need it, and strip sensitive fields from responses and error output at the boundary rather than relying on the client not to read them. Alongside that, restrict the management interface to trusted networks and apply the vendor's recommended configuration mitigations.
Frequently Asked Questions
Is CVE-2017-0059 being exploited in your environment?
Detect and block the exploit chain at execution, on systems you cannot patch yet.