CVE-2021-26937

Exploitation

Not assessed. CISA has not published an exploitation assessment for this record, and it is not in the KEV catalog. That is an absence of assessment, not a finding of no risk.

SSVC decision

Not assessed by CISA

EPSS probability

9.15% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 94.9% of scored records. A rank, not a probability.

NVD base score

9.8 (CVSS v3.x), scored by the NVD independently of the CNA.

NVD CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

NVD analysis status

Modified. NVD last modified this record on 2026-06-17.

Red Hat severity

Important. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

Published

2021-02-09 19:35Z5 YR AGO

Last updated

2025-05-09 20:03Z1 YR AGO

Reserved

2021-02-09

Assigning CNA

mitre

Record state

PUBLISHED

Severity

Not rated by the issuing CNA

CNA CVSS vector

Not published by the issuing CNA

Weaknesses

• CWE-88Improper Neutralization of Argument Delimiters in a Command ('Argument Injection')Base
• CWE-787Out-of-bounds WriteBase

Data version

5.1

Document digest

ed78078873a2263321458818abb048d0241e9560d72463dc72d807e2e4553d1c

• lists.gnu.orghttps://lists.gnu.org/archive/html/screen-devel/2021-02/msg00000.htmlx_refsource_MISC
• www.openwall.comhttps://www.openwall.com/lists/oss-security/2021/02/09/3x_refsource_MISC
• ftp.gnu.orghttps://ftp.gnu.org/gnu/screen/x_refsource_MISC
• www.openwall.com[oss-security] 20210210 Re: screen crash processing combining charactershttp://www.openwall.com/lists/oss-security/2021/02/09/8mailing-listx_refsource_MLIST
• lists.debian.org[debian-lts-announce] 20210219 [SECURITY] [DLA 2570-1] screen security updatehttps://lists.debian.org/debian-lts-announce/2021/02/msg00031.htmlmailing-listx_refsource_MLIST
• www.debian.orgDSA-4861https://www.debian.org/security/2021/dsa-4861vendor-advisoryx_refsource_DEBIAN
• lists.fedoraproject.orgFEDORA-2021-5e9894a0c5https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JJWLXP45POUUYBJRRWPVAWNZDJTLYWVM/vendor-advisoryx_refsource_FEDORA
• lists.fedoraproject.orgFEDORA-2021-9107eeb95chttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/GNWBOIDEPOEQS5RMQVMFKHKXJCGNYWBL/vendor-advisoryx_refsource_FEDORA
• security.gentoo.orgGLSA-202105-11https://security.gentoo.org/glsa/202105-11vendor-advisoryx_refsource_GENTOO
• security.netapp.comhttps://security.netapp.com/advisory/ntap-20250509-0004/