How severe is CVE-2021-3514?

CVE-2021-3514 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2021-3514 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (64th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-3514?

CVE-2021-3514 affects Redhat 389 Directory Server. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-3514?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2021-3514 published?

CVE-2021-3514 was published on 2021-05-28 and last updated on 2026-06-17.

CVE-2021-3514

CVE-2021-3514 is a medium-severity vulnerability in Redhat 389 Directory Server with a CVSS 3.x base score of 6.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-476.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
CVSS v2: 4.0
EPSS exploit prediction: 1% (64th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-476
Affected product: Redhat 389 Directory Server
Published: 2021-05-28
Last modified: 2026-06-17

Description

When using a sync_repl client in 389-ds-base, an authenticated attacker can cause a NULL pointer dereference using a specially crafted query, causing a crash.

Frequently asked questions

What is CVE-2021-3514?: When using a sync_repl client in 389-ds-base, an authenticated attacker can cause a NULL pointer dereference using a specially crafted query, causing a crash.
How severe is CVE-2021-3514?: CVE-2021-3514 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2021-3514 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (64th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-3514?: CVE-2021-3514 affects Redhat 389 Directory Server. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-3514?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-3514 published?: CVE-2021-3514 was published on 2021-05-28 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:o:redhat:389_directory_server:-:*:*:*:*:*:*:*

More vulnerabilities in Redhat 389 Directory Server

CVE-2026-9064 — High (CVSS 7.5): A flaw was found in 389-ds-base. The get_ldapmessage_controls_ext() function in the LDAP server does not enforce an…
CVE-2022-1949 — High (CVSS 7.5): An access control bypass vulnerability found in 389-ds-base. That mishandling of the filter that would yield incorrect…
CVE-2010-2222 — High (CVSS 7.5): The _ger_parse_control function in Red Hat Directory Server 8 and the 389 Directory Server allows attackers to cause a…
CVE-2026-11611 — Medium (CVSS 6.5): A flaw was found in 389 Directory Server. The Content Synchronization persistent search plugin allows unbounded memory…
CVE-2024-6237 — Medium (CVSS 6.5): A flaw was found in the 389 Directory Server. This flaw allows an unauthenticated user to cause a systematic server…
CVE-2022-0996 — Medium (CVSS 6.5): A vulnerability was found in the 389 Directory Server that allows expired passwords to access the database to cause…

All CVEs affecting Redhat 389 Directory Server →

Other CWE-476 (NULL Pointer Dereference) vulnerabilities

CVE-2022-36648 — Critical (CVSS 10.0): The hardware emulation in the of_dpa_cmd_add_l2_flood of rocker device model in QEMU, as used in 7.0.0 and earlier,…
CVE-2020-14500 — Critical (CVSS 10.0): Secomea GateManager all versions prior to 9.2c, An attacker can send a negative value and overwrite arbitrary data.
CVE-2010-2495 — Critical (CVSS 10.0): The pppol2tp_xmit function in drivers/net/pppol2tp.c in the L2TP implementation in the Linux kernel before 2.6.34 does…
CVE-2026-46195 — Critical (CVSS 9.8): In the Linux kernel, the following vulnerability has been resolved: smb: client: validate dacloffset before building…
CVE-2026-31657 — Critical (CVSS 9.8): In the Linux kernel, the following vulnerability has been resolved: batman-adv: hold claim backbone gateways by…
CVE-2026-31436 — Critical (CVSS 9.8): In the Linux kernel, the following vulnerability has been resolved: dmaengine: idxd: fix possible wrong descriptor…

Browse all CWE-476 (NULL Pointer Dereference) vulnerabilities →