Vulnerability in Invisible-Island Xterm
CVE-2021-27135
xterm before Patch #366 allows remote attackers to execute arbitrary code or cause a denial of service (segmentation fault) via a crafted UTF-8 combining character sequence.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.078 (94.7th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 95th percentile — 94.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.078 · newest: 0.078 · change: 0.000
Affected products
- Invisible-Island Xterm
- Debian Linux — versions 9.0
- Fedoraproject Fedora — versions 33
Public proof-of-concept exploits
References
- www.openwall.com/lists/oss-security/2021/02/09/7 (Mailing List, Third Party Advisory)
- www.openwall.com/lists/oss-security/2021/02/09/9 (Mailing List, Third Party Advisory)
- www.openwall.com/lists/oss-security/2021/02/10/7 (mailing-list, Mailing List, Third Party Advisory)
- lists.debian.org/debian-lts-announce/2021/02/msg00019.html (mailing-list, Mailing List, Third Party Advisory)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
- news.ycombinator.com/item (Third Party Advisory, Issue Tracking)
- access.redhat.com/security/cve/CVE-2021-27135 (Third Party Advisory)
- bugzilla.redhat.com/show_bug.cgi (Issue Tracking)
- invisible-island.net/xterm/xterm.log.html (Release Notes, Vendor Advisory)
- github.com/ThomasDickey/xterm-snapshots/commit/82ba55b8f994ab30ff561a347b82ea34… (Patch, Third Party Advisory)
Frequently asked questions
- What is CVE-2021-27135?
- CVE-2021-27135 is a critical-severity vulnerability in Invisible-Island Xterm. CVSS score: 9.8/10. Published 2021-02-10.
- How severe is CVE-2021-27135?
- Critical severity. CVSS v3 base score is 9.8 out of 10.
- Is CVE-2021-27135 known to be exploited?
- 3 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.