CVE-2021-30761
Apple iOS: WebKit Memory Corruption
As of , CVE-2021-30761 in Apple iOS is on CISA's list of exploited vulnerabilities: CISA listed it on . Our patch-first group: Patch soon.
- Exploited
- Yes: CISA listed it on 3 November 2021
- US federal deadline
- 17 November 202114 days after CISA listed it. US federal civilian agencies must fix it by then.
- Used in ransomware campaigns
- Not known to CISA
- EPSS score
- 0.11Higher than 95% of the CVEs EPSS scores. EPSS estimates the chance of exploitation activity in the next 30 days.
- EPSS when listed
- Not availableCISA listed it before 4 February 2022, where the EPSS files we read begin.
- Public exploit
- None foundNeither Metasploit nor Exploit-DB lists one.
- Fix
- No vendor link in CISA's entry
What CISA says to do
Apply updates per vendor instructions.
CISA's required action
What the flaw is
Apple iOS WebKit contains a memory corruption vulnerability that leads to code execution when processing maliciously crafted web content. This vulnerability could impact HTML parsers that use WebKit, including but not limited to Apple Safari and non-Apple products which rely on WebKit for HTML processing.
CISA's description
A memory corruption issue was addressed with improved state management. This issue is fixed in iOS 12.5.4. Processing maliciously crafted web content may lead to arbitrary code execution. Apple is aware of a report that this issue may have been actively exploited..
The CVE record's description, from apple
- CVE published
- 8 September 2021
- Assigned by
- apple
- CVSS
- 8.8 High (CVSS 3.1, from CISA-ADP)
- CWE-787
- Out-of-bounds Write
- CISA SSVC, exploitation
- active
- CISA SSVC, automatable
- no
- CISA SSVC, technical impact
- total
Timeline
- The CVE record was published.
- CISA added it to its list of exploited vulnerabilities.
- The US federal deadline to fix it.
iOS: other exploited entries
| Vulnerability | Product | Our group | Listed | Deadline | EPSS |
|---|---|---|---|---|---|
| CVE-2016-4657Webkit Memory Corruption | Apple iOS | Patch this weekMetasploit module; EPSS 0.67; verified Exploit-DB entry | 0.67 | ||
| CVE-2016-4655Information Disclosure | Apple iOS | Patch this weekMetasploit module; verified Exploit-DB entry | 0.33 | ||
| CVE-2016-4656Memory Corruption | Apple iOS | Patch this weekMetasploit module; verified Exploit-DB entry | 0.24 | ||
| CVE-2021-30762WebKit Use-After-Free | Apple iOS | Patch soon | 0.11 | ||
| CVE-2022-42856Type Confusion | Apple iOS | Patch soon | 0.09 | ||
| CVE-2019-7287Memory Corruption | Apple iOS | Patch soon | 0.05 | ||
| CVE-2021-30666WebKit Buffer Overflow | Apple iOS | Patch soon | 0.03 |
Read further
- CVE recordcve.org
- NVD entrynvd.nist.gov
- CISA's catalogcisa.gov
- EPSS for this CVEapi.first.org