The Mozilla Foundation yesterday issued version 67 of its Firefox browser and version 60.7 of Firefox Extended Support Release (ESR), in the process patching 24 vulnerabilities between them, two of them critical.

The two most serious flaws consisted of a series of memory bugs found by the browser’s developers and the greater Mozilla community. The first set of bugs, designated CVE-2019-9814, was found only in Firefox, while the second group, CVE-2018-9800, was discovered in both Firefox and Firefox ESR.

“Some of these bugs showed evidence of memory corruption and we presume that with enough effort that some of these could be exploited to run arbitrary code,” the Mozilla Foundation warned in a pair of product security advisories.

Altogether, Firefox was found to contain 21 bugs. Eleven of them are rated high in severity, six are judged to be moderate, and two are low-rated threats. Meanwhile, Firefox ESR was found to contain 12 high-severity threats and three moderate-level threats, for 15 in total.