8.8

CVE-2021-21974: vmware cloud_foundation Out-of-bounds Write

CVSS: 8.8v3.1HighModified
Published 24-02-2021Last modified 02-06-2026
Open JSON

Vulnerability summary

CVE-2021-21974 is a high (CVSS 8.8) Out-of-bounds Write vulnerability in vmware cloud_foundation. EPSS estimates a 45.06% chance of exploitation in the next 30 days, higher than 98.7% of scored vulnerabilities. 1 public exploit is recorded.

Overall risk
54/100
0100
High · default modelHow is this calculated?
CVSS score
8.8/10
010
High · v3.1 (CVE.org)
EPSS score
45.06%
0%100%
High · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits1reference

Timeline

  1. 24-02-2021
    PublishedVulnerability first disclosed.
  2. 02-06-2026
    Last modifiedVulnerability information updated.

Description

OpenSLP as used in ESXi (7.0 before ESXi70U1c-17325551, 6.7 before ESXi670-202102401-SG, 6.5 before ESXi650-202102101-SG) has a heap-overflow vulnerability. A malicious actor residing within the same network segment as ESXi who has access to port 427 may be able to trigger the heap-overflow issue in OpenSLP service resulting in remote code execution.

CVSS metrics

3 scores · 2 sources · 2 versions

EPSS trend

Probability

45.06%

Chance of exploitation in the next 30 days

Percentile

99%

Versus all other CVEs

30-day change

0.00 pp

From 45.06% on 18-09-2026

18-09-202618-10-2026
EPSS score
45.06%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

1 found
  • referenceUnverified

    Exploit Reference (packetstormsecurity.com)

    Maturity: unknown

Weaknesses

CWE · root cause

Affected systems

Vmware2 products
  • cloud_foundation≥ 3.0, < 3.10.1.2 | ≥ 4.0, < 4.2
  • esxiEOL6.5 | 6.5:2 | 6.5:650-201701001 | 6.5:650-201703001 | 6.5:650-201703002 | 6.5:650-201704001 | 6.5:650-201707101 | 6.5:650-201707102 | 6.5:650-201707103 | 6.5:650-201707201 | 6.5:650-201707202 | 6.5:650-201707203 | 6.5:650-201707204 | 6.5:650-201707205 | 6.5:650-201707206 | 6.5:650-201707207 | 6.5:650-201707208 | 6.5:650-201707209 | 6.5:650-201707210 | 6.5:650-201707211 | 6.5:650-201707212 | 6.5:650-201707213 | 6.5:650-201707214 | 6.5:650-201707215 | 6.5:650-201707216 | 6.5:650-201707217 | 6.5:650-201707218 | 6.5:650-201707219 | 6.5:650-201707220 | 6.5:650-201707221 | 6.5:650-201710001 | 6.5:650-201712001 | 6.5:650-201803001 | 6.5:650-201806001 | 6.5:650-201808001 | 6.5:650-201810001 | 6.5:650-201810002 | 6.5:650-201811001 | 6.5:650-201811002 | 6.5:650-201811301 | 6.5:650-201901001 | 6.5:650-201903001 | 6.5:650-201905001 | 6.5:650-201908001 | 6.5:650-201910001 | 6.5:650-20191004001 | 6.5:650-201911001 | 6.5:650-201911401 | 6.5:650-201911402 | 6.5:650-201912001 | 6.5:650-201912002 | 6.5:650-201912101 | 6.5:650-201912102 | 6.5:650-201912103 | 6.5:650-201912104 | 6.5:650-201912301 | 6.5:650-201912401 | 6.5:650-201912402 | 6.5:650-201912403 | 6.5:650-201912404 | 6.5:650-202005001 | 6.5:650-202006001 | 6.5:650-202007001 | 6.5:650-202010001 | 6.5:650-202011001 | 6.5:650-202011002 | 6.5:650-202102001 | 6.7 | 6.7:670-201806001 | 6.7:670-201807001 | 6.7:670-201808001 | 6.7:670-201810001 | 6.7:670-201810101 | 6.7:670-201810102 | 6.7:670-201810103 | 6.7:670-201810201 | 6.7:670-201810202 | 6.7:670-201810203 | 6.7:670-201810204 | 6.7:670-201810205 | 6.7:670-201810206 | 6.7:670-201810207 | 6.7:670-201810208 | 6.7:670-201810209 | 6.7:670-201810210 | 6.7:670-201810211 | 6.7:670-201810212 | 6.7:670-201810213 | 6.7:670-201810214 | 6.7:670-201810215 | 6.7:670-201810216 | 6.7:670-201810217 | 6.7:670-201810218 | 6.7:670-201810219 | 6.7:670-201810220 | 6.7:670-201810221 | 6.7:670-201810222 | 6.7:670-201810223 | 6.7:670-201810224 | 6.7:670-201810225 | 6.7:670-201810226 | 6.7:670-201810227 | 6.7:670-201810228 | 6.7:670-201810229 | 6.7:670-201810230 | 6.7:670-201810231 | 6.7:670-201810232 | 6.7:670-201810233 | 6.7:670-201810234 | 6.7:670-201811001 | 6.7:670-201901001 | 6.7:670-201901401 | 6.7:670-201901402 | 6.7:670-201901403 | 6.7:670-201903001 | 6.7:670-201904001 | 6.7:670-201904201 | 6.7:670-201904201-ug | 6.7:670-201904202 | 6.7:670-201904202-ug | 6.7:670-201904203 | 6.7:670-201904203-ug | 6.7:670-201904204 | 6.7:670-201904204-ug | 6.7:670-201904205 | 6.7:670-201904205-ug | 6.7:670-201904206 | 6.7:670-201904206-ug | 6.7:670-201904207 | 6.7:670-201904207-ug | 6.7:670-201904208 | 6.7:670-201904208-ug | 6.7:670-201904209 | 6.7:670-201904209-ug | 6.7:670-201904210 | 6.7:670-201904210-ug | 6.7:670-201904211 | 6.7:670-201904211-ug | 6.7:670-201904212 | 6.7:670-201904212-ug | 6.7:670-201904213 | 6.7:670-201904213-ug | 6.7:670-201904214 | 6.7:670-201904214-ug | 6.7:670-201904215 | 6.7:670-201904215-ug | 6.7:670-201904216 | 6.7:670-201904216-ug | 6.7:670-201904217 | 6.7:670-201904217-ug | 6.7:670-201904218 | 6.7:670-201904218-ug | 6.7:670-201904219 | 6.7:670-201904219-ug | 6.7:670-201904220 | 6.7:670-201904220-ug | 6.7:670-201904221 | 6.7:670-201904221-ug | 6.7:670-201904222 | 6.7:670-201904222-ug | 6.7:670-201904223 | 6.7:670-201904223-ug | 6.7:670-201904224 | 6.7:670-201904224-ug | 6.7:670-201904225 | 6.7:670-201904225-ug | 6.7:670-201904226 | 6.7:670-201904226-ug | 6.7:670-201904227 | 6.7:670-201904227-ug | 6.7:670-201904228 | 6.7:670-201904228-ug | 6.7:670-201904229 | 6.7:670-201904229-ug | 6.7:670-201905001 | 6.7:670-201906002 | 6.7:670-201908101 | 6.7:670-201908102 | 6.7:670-201908103 | 6.7:670-201908104 | 6.7:670-201908201 | 6.7:670-201908202 | 6.7:670-201908203 | 6.7:670-201908204 | 6.7:670-201908205 | 6.7:670-201908206 | 6.7:670-201908207 | 6.7:670-201908208 | 6.7:670-201908209 | 6.7:670-201908210 | 6.7:670-201908211 | 6.7:670-201908212 | 6.7:670-201908213 | 6.7:670-201908214 | 6.7:670-201908215 | 6.7:670-201908216 | 6.7:670-201908217 | 6.7:670-201908218 | 6.7:670-201908219 | 6.7:670-201908220 | 6.7:670-201908221 | 6.7:670-201912001 | 6.7:670-201912101 | 6.7:670-201912102 | 6.7:670-201912401 | 6.7:670-201912402 | 6.7:670-201912403 | 6.7:670-201912404 | 6.7:670-201912405 | 6.7:670-202004001 | 6.7:670-202004002 | 6.7:670-202004301 | 6.7:670-202004401 | 6.7:670-202004402 | 6.7:670-202004403 | 6.7:670-202004404 | 6.7:670-202004405 | 6.7:670-202004406 | 6.7:670-202004407 | 6.7:670-202004408 | 6.7:670-202006001 | 6.7:670-202008001 | 6.7:670-202010001 | 6.7:670-202011001 | 6.7:670-202011002 | 6.7:670-202102001 | 7.0.0 | 7.0.0:b | 7.0.0:update_1 | 7.0.0:update_1a | 7.0.0:update_1b

1 vendor · 2 products

References

3 links