Vulnerability Details : CVE-2021-26937
Potential exploit
encoding.c in GNU Screen through 4.8.0 allows remote attackers to cause a denial of service (invalid write access and application crash) or possibly have unspecified other impact via a crafted UTF-8 character sequence.
Vulnerability category: Denial of service
Products affected by CVE-2021-26937
- cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
- cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*
- cpe:2.3:a:gnu:screen:*:*:*:*:*:*:*:*
- cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:*
- cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2021-26937
1.43%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 80 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2021-26937
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
7.5
|
HIGH | AV:N/AC:L/Au:N/C:P/I:P/A:P |
10.0
|
6.4
|
NIST | |
|
9.8
|
CRITICAL | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
3.9
|
5.9
|
NIST |
CWE ids for CVE-2021-26937
-
The product constructs a string for a command to be executed by a separate component in another control sphere, but it does not properly delimit the intended arguments, options, or switches within that command string.Assigned by: nvd@nist.gov (Primary)
References for CVE-2021-26937
-
http://www.openwall.com/lists/oss-security/2021/02/09/8
oss-security - Re: screen crash processing combining charactersExploit;Mailing List;Third Party Advisory
-
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JJWLXP45POUUYBJRRWPVAWNZDJTLYWVM/
[SECURITY] Fedora 32 Update: screen-4.8.0-5.fc32 - package-announce - Fedora Mailing-Lists
-
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/GNWBOIDEPOEQS5RMQVMFKHKXJCGNYWBL/
[SECURITY] Fedora 33 Update: screen-4.8.0-5.fc33 - package-announce - Fedora Mailing-Lists
-
https://www.debian.org/security/2021/dsa-4861
Debian -- Security Information -- DSA-4861-1 screenThird Party Advisory
-
https://security.netapp.com/advisory/ntap-20250509-0004/
CVE-2021-26937 GNU Screen Vulnerability in NetApp Products | NetApp Product Security
-
https://security.gentoo.org/glsa/202105-11
GNU Screen: User-assisted execution of arbitrary code (GLSA 202105-11) — Gentoo securityThird Party Advisory
-
https://www.openwall.com/lists/oss-security/2021/02/09/3
oss-security - screen crash processing combining charactersExploit;Mailing List;Third Party Advisory
-
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/JJWLXP45POUUYBJRRWPVAWNZDJTLYWVM/
[SECURITY] Fedora 32 Update: screen-4.8.0-5.fc32 - package-announce - Fedora Mailing-ListsMailing List;Third Party Advisory
-
https://ftp.gnu.org/gnu/screen/
Index of /gnu/screenProduct
-
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/GNWBOIDEPOEQS5RMQVMFKHKXJCGNYWBL/
[SECURITY] Fedora 33 Update: screen-4.8.0-5.fc33 - package-announce - Fedora Mailing-ListsMailing List;Third Party Advisory
-
https://lists.debian.org/debian-lts-announce/2021/02/msg00031.html
[SECURITY] [DLA 2570-1] screen security updateMailing List;Third Party Advisory
-
https://lists.gnu.org/archive/html/screen-devel/2021-02/msg00000.html
[screen-devel] [bug #60030] Screen segfaults by displaying some UTF-8 chExploit;Mailing List;Vendor Advisory
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