Details for this vulnerability have not been published by NIST at this point. Descriptions from software vendor advisories for this issue are provided below.
Chrome Releases reports:
This update contains 38 security fixes, including:
 Critical CVE-2020-6510: Heap buffer overflow in
background fetch. Reported by Leecraso and Guang Gong of 360
Alpha Lab working with 360 BugCloud on 2020-07-08
 High CVE-2020-6511: Side-channel information leakage
in content security policy. Reported by Mikhail Oblozhikhin on
 High CVE-2020-6512: Type Confusion in V8. Reported by
nocma, leogan, cheneyxu of WeChat Open Platform Security Team on
 High CVE-2020-6513: Heap buffer overflow in PDFium.
Reported by Aleksandar Nikolic of Cisco Talos on 2020-06-04
 High CVE-2020-6514: Inappropriate implementation in
WebRTC. Reported by Natalie Silvanovich of Google Project Zero on
 High CVE-2020-6515: Use after free in tab strip.
Reported by DDV_UA on 2020-05-14
 High CVE-2020-6516: Policy bypass in CORS. Reported by
Yongke Wang(@Rudykewang) and Aryb1n(@aryb1n) of Tencent Security
Xuanwu Lab on 2020-06-08
 High CVE-2020-6517: Heap buffer overflow in history.
Reported by ZeKai Wu (@hellowuzekai) of Tencent Security Xuanwu
Lab on 2020-06-16
 Medium CVE-2020-6518: Use after free in developer
tools. Reported by David Erceg on 2019-07-20
 Medium CVE-2020-6519: Policy bypass in CSP. Reported
by Gal Weizman (@WeizmanGal) of PerimeterX on 2020-03-25
 Medium CVE-2020-6520: Heap buffer overflow in Skia.
Reported by Zhen Zhou of NSFOCUS Security Team on 2020-06-08
 Medium CVE-2020-6521: Side-channel information leakage
in autofill. Reported by Xu Lin (University of Illinois at
Chicago), Panagiotis Ilia (University of Illinois at Chicago),
Jason Polakis (University of Illinois at Chicago) on
 Medium CVE-2020-6522: Inappropriate implementation in
external protocol handlers. Reported by Eric Lawrence of Microsoft
 Medium CVE-2020-6523: Out of bounds write in Skia.
Reported by Liu Wei and Wu Zekai of Tencent Security Xuanwu Lab on
 Medium CVE-2020-6524: Heap buffer overflow in
WebAudio. Reported by Sung Ta (@Mipu94) of SEFCOM Lab, Arizona
State University on 2020-05-12
 Medium CVE-2020-6525: Heap buffer overflow in Skia.
Reported by Zhen Zhou of NSFOCUS Security Team on 2020-06-05
 Low CVE-2020-6526: Inappropriate implementation in
iframe sandbox. Reported by Jonathan Kingston on 2020-04-24
 Low CVE-2020-6527: Insufficient policy enforcement in
CSP. Reported by Zhong Zhaochen of andsecurity.cn on
 Low CVE-2020-6528: Incorrect security UI in basic
auth. Reported by Rayyan Bijoora on 2020-03-22
 Low CVE-2020-6529: Inappropriate implementation in
WebRTC. Reported by kaustubhvats7 on 2019-06-26
 Low CVE-2020-6530: Out of bounds memory access in
developer tools. Reported by myvyang on 2019-10-21
 Low CVE-2020-6531: Side-channel information leakage in
scroll to text. Reported by Jun Kokatsu, Microsoft Browser
Vulnerability Research on 2020-01-17
 Low CVE-2020-6533: Type Confusion in V8. Reported by
Avihay Cohen @ SeraphicAlgorithms on 2020-04-11
 Low CVE-2020-6534: Heap buffer overflow in WebRTC.
Reported by Anonymous on 2020-04-20
 Low CVE-2020-6535: Insufficient data validation in
WebUI. Reported by Jun Kokatsu, Microsoft Browser Vulnerability
Research on 2020-04-22
 Low CVE-2020-6536: Incorrect security UI in PWAs.
Reported by Zhiyang Zeng of Tencent security platform department