Out-of-bounds Read in Apple macOS
CVE-2019-20838
libpcre in PCRE before 8.43 allows a subject buffer over-read in JIT when UTF is disabled, and \X or \R has more than one fixed quantifier, a related issue to CVE-2019-20454.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.028 (85.8th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 86th percentile — 85.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.028 · newest: 0.028 · change: 0.000
Affected products
- Apple macOS
- Pcre
- Splunk Universal Forwarder — versions 9.1.0
Weakness classification (CWE)
Public proof-of-concept exploits
References
- bugs.gentoo.org/717920 (Patch, VDB Entry, Third Party Advisory, Issue Tracking)
- www.pcre.org/original/changelog.txt (Release Notes, Vendor Advisory)
- support.apple.com/kb/HT211931 (Vendor Advisory)
- seclists.org/fulldisclosure/2020/Dec/32 (mailing-list, Mailing List, Third Party Advisory)
- support.apple.com/kb/HT212147 (Vendor Advisory)
- seclists.org/fulldisclosure/2021/Feb/14 (mailing-list, Mailing List, Third Party Advisory)
- lists.apache.org/thread.html/rf9fa47ab66495c78bb4120b0754dd9531ca2ff0430f6685ac… (mailing-list, Mailing List, Third Party Advisory)
Frequently asked questions
- What is CVE-2019-20838?
- CVE-2019-20838 is a high-severity vulnerability in Apple macOS, classified under Out-of-bounds Read. CVSS score: 7.5/10. Published 2020-06-15.
- How severe is CVE-2019-20838?
- High severity. CVSS v3 base score is 7.5 out of 10.
- Is CVE-2019-20838 known to be exploited?
- 17 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.