CVE-2021-27135
xterm: crash when processing combining characters
Severity Score
9.8
*CVSS v3.1
Exploit Likelihood
*EPSS
Affected Versions
*CPE
Public Exploits
0
*Multiple Sources
Exploited in Wild
-
*KEV
Decision
-
*SSVC
Descriptions
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.
xterm antes del parche #366 permite a los atacantes remotos ejecutar código arbitrario o provocar una denegación de servicio (fallo de segmentación) a través de una secuencia de caracteres de combinación UTF-8 manipulada
A flaw was found in xterm. A specially crafted sequence of combining characters causes an out of bounds write leading to arbitrary code execution. The highest threat from this vulnerability is to confidentiality, integrity, as well as system availability.
*Credits:
N/A
CVSS Scores
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality
Integrity
Availability
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality
Integrity
Availability
Attack Vector
Attack Complexity
Authentication
Confidentiality
Integrity
Availability
* Common Vulnerability Scoring System
SSVC
- Decision:-
Exploitation
Automatable
Tech. Impact
* Organization's Worst-case Scenario
Timeline
- 2021-02-10 CVE Reserved
- 2021-02-10 CVE Published
- 2023-11-08 EPSS Updated
- 2024-08-03 CVE Updated
- ---------- Exploited in Wild
- ---------- KEV Due Date
- ---------- First Exploit
CWE
- CWE-787: Out-of-bounds Write
CAPEC
References (13)
| URL | Tag | Source |
|---|---|---|
| http://seclists.org/fulldisclosure/2021/May/52 | Mailing List |
|
| http://www.openwall.com/lists/oss-security/2021/02/10/7 | Mailing List |
|
| https://bugzilla.suse.com/show_bug.cgi?id=1182091 | Issue Tracking | |
| https://lists.debian.org/debian-lts-announce/2021/02/msg00019.html | Mailing List |
|
| https://news.ycombinator.com/item?id=26524650 | Issue Tracking | |
| https://www.openwall.com/lists/oss-security/2021/02/09/7 | Mailing List |
|
| https://www.openwall.com/lists/oss-security/2021/02/09/9 | Mailing List |
|
| URL | Date | SRC |
|---|
| URL | Date | SRC |
|---|---|---|
| https://github.com/ThomasDickey/xterm-snapshots/commit/82ba55b8f994ab30ff561a347b82ea340ba7075c | 2023-11-07 |
Affected Vendors, Products, and Versions
| Vendor | Product | Version | Other | Status | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Vendor | Product | Version | Other | Status | <-- --> | Vendor | Product | Version | Other | Status |
| Invisible-island Search vendor "Invisible-island" | Xterm Search vendor "Invisible-island" for product "Xterm" | < 366 Search vendor "Invisible-island" for product "Xterm" and version " < 366" | - |
Affected
| ||||||
| Debian Search vendor "Debian" | Debian Linux Search vendor "Debian" for product "Debian Linux" | 9.0 Search vendor "Debian" for product "Debian Linux" and version "9.0" | - |
Affected
| ||||||
| Fedoraproject Search vendor "Fedoraproject" | Fedora Search vendor "Fedoraproject" for product "Fedora" | 33 Search vendor "Fedoraproject" for product "Fedora" and version "33" | - |
Affected
| ||||||