7.8

CVE-2021-36089: zope grok Out-of-bounds Write

Modified
AliasesDEBIAN-CVE-2021-36089
Published 01-07-2021Last modified 04-08-2024

Vulnerability summary

CVE-2021-36089 is a high (CVSS 7.8) Out-of-bounds Write vulnerability in zope grok. EPSS estimates a 1.18% chance of exploitation in the next 30 days, higher than 67.6% of scored vulnerabilities. 1 public exploit is recorded.

Priority
Prioritisepublic exploit

Public exploit (reference, Date unknown)

Source freshness unavailable

How is this decided?
CVSS score
7.8/10
010
High · v3.1 (NVD)
EPSS score
1.18%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits1reference

Timeline

  1. 01-07-2021
    PublishedVulnerability first disclosed.
  2. 04-08-2024
    Last modifiedVulnerability information updated.

Description

Grok 7.6.6 through 9.2.0 has a heap-based buffer overflow in grk::FileFormatDecompress::apply_palette_clr (called from grk::FileFormatDecompress::applyColour).

CVSS metrics

3 scores · 2 sources · 2 versions

EPSS trend

Probability

1.18%

Chance of exploitation in the next 30 days

Percentile

68%

Versus all other CVEs

30-day change

No change 0.00 pp

From 1.18% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

1 found
  • referenceUnverified

    Exploit Reference (bugs.chromium.org)

    Maturity: unknown

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: local access, no authentication, user interaction (CVSS vector). Other conditions: not stated in public data.

Debian1 product
  • libgrokj2k< 9.5.0-1
Zope1 product
  • grok≥ 7.6.6, ≤ 9.2.0

2 vendors · 2 products

References

4 links